diff --git a/README.md b/README.md
index e915f387..594bcd3c 100644
--- a/README.md
+++ b/README.md
@@ -124,9 +124,9 @@ See [action.yml](action.yml).
 | `purge`                           | <ul> <li>When <code>true</code>, the action purges (possibly zero) caches.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | `false`  | `false`               |
 | `purge-primary-key`               | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When <code>always</code>, the action always purges cache with the <code>primary-key</code>.</li> <li>When <code>never</code>, the action never purges cache with the <code>primary-key</code>.</li> <li>Otherwise, this input has no effect..</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                             | `false`  | `""`                  |
 | `purge-prefixes`                  | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When a newline-separated non-empty list of non-empty cache key prefixes, the action selects for purging all caches whose keys match some of these prefixes and that are scoped to the current <a href="https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables">GITHUB_REF</a>.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                     | `false`  | `""`                  |
-| `purge-last-accessed`             | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When a number, the action purges selected caches that were last accessed more than this number of seconds ago relative to the start of the <code>Post Restore</code> phase.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                                 | `false`  | `""`                  |
-| `purge-created`                   | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When a number, the action purges caches created more than this number of seconds ago relative to the start of the <code>Post Restore</code> phase.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | `false`  | `""`                  |
-| `upload-chunk-size`               | <ul> <li>When a number, the action uses it as the chunk size (in bytes) to split up large files during upload.</li> <li>Otherwise, the action uses the default value <code>33554432</code> (32MB).</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | `false`  | `""`                  |
+| `purge-last-accessed`             | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When a non-negative number, the action purges selected caches that were last accessed more than this number of seconds ago relative to the start of the <code>Post Restore</code> phase.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                    | `false`  | `""`                  |
+| `purge-created`                   | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When a non-negative number, the action purges selected caches that were created more than this number of seconds ago relative to the start of the <code>Post Restore</code> phase.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                          | `false`  | `""`                  |
+| `upload-chunk-size`               | <ul> <li>When a non-negative number, the action uses it as the chunk size (in bytes) to split up large files during upload.</li> <li>Otherwise, the action uses the default value <code>33554432</code> (32MB).</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | `false`  | `""`                  |
 | `save-always`                     | <p>Run the post step to save the cache even if another step before fails.</p>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | `false`  | `false`               |
 | `token`                           | <p>The action uses it to communicate with GitHub API.</p>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | `false`  | `${{ github.token }}` |
 
diff --git a/action.yml b/action.yml
index d87466cf..17f8c9ec 100644
--- a/action.yml
+++ b/action.yml
@@ -113,13 +113,13 @@ inputs:
   purge-last-accessed:
     description: |
       - Can have an effect only when `purge: true`.
-      - When a number, the action purges selected caches that were last accessed more than this number of seconds ago relative to the start of the `Post Restore` phase.
+      - When a non-negative number, the action purges selected caches that were last accessed more than this number of seconds ago relative to the start of the `Post Restore` phase.
       - Otherwise, this input has no effect.
     default: ""
   purge-created:
     description: |
       - Can have an effect only when `purge: true`.
-      - When a number, the action purges caches created more than this number of seconds ago relative to the start of the `Post Restore` phase.
+      - When a non-negative number, the action purges selected caches that were created more than this number of seconds ago relative to the start of the `Post Restore` phase.
       - Otherwise, this input has no effect.
     default: ""
 
@@ -127,7 +127,7 @@ inputs:
     # The original default value may be provided here (https://github.com/actions/cache/issues/1292)
     # 32MB
     description: |
-      - When a number, the action uses it as the chunk size (in bytes) to split up large files during upload.
+      - When a non-negative number, the action uses it as the chunk size (in bytes) to split up large files during upload.
       - Otherwise, the action uses the default value `33554432` (32MB).
     default: ""
   
diff --git a/save/README.md b/save/README.md
index ecf70d8a..12d0f8a5 100644
--- a/save/README.md
+++ b/save/README.md
@@ -22,9 +22,9 @@ The save action saves a cache. It works similarly to the `cache` action except t
 | `purge`                   | <ul> <li>When <code>true</code>, the action purges (possibly zero) caches.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | `false`  | `false`               |
 | `purge-primary-key`       | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When <code>always</code>, the action always purges cache with the <code>primary-key</code>.</li> <li>When <code>never</code>, the action never purges cache with the <code>primary-key</code>.</li> <li>Otherwise, this input has no effect..</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                 | `false`  | `""`                  |
 | `purge-prefixes`          | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When a newline-separated non-empty list of non-empty cache key prefixes, the action selects for purging all caches whose keys match some of these prefixes and that are scoped to the current <a href="https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables">GITHUB_REF</a>.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                         | `false`  | `""`                  |
-| `purge-last-accessed`     | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When a number, the action purges selected caches that were last accessed more than this number of seconds ago relative to the start of the <code>Post Restore</code> phase.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                     | `false`  | `""`                  |
-| `purge-created`           | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When a number, the action purges caches created more than this number of seconds ago relative to the start of the <code>Post Restore</code> phase.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                              | `false`  | `""`                  |
-| `upload-chunk-size`       | <ul> <li>When a number, the action uses it as the chunk size (in bytes) to split up large files during upload.</li> <li>Otherwise, the action uses the default value <code>33554432</code> (32MB).</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | `false`  | `""`                  |
+| `purge-last-accessed`     | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When a non-negative number, the action purges selected caches that were last accessed more than this number of seconds ago relative to the start of the <code>Post Restore</code> phase.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                        | `false`  | `""`                  |
+| `purge-created`           | <ul> <li>Can have an effect only when <code>purge: true</code>.</li> <li>When a non-negative number, the action purges selected caches that were created more than this number of seconds ago relative to the start of the <code>Post Restore</code> phase.</li> <li>Otherwise, this input has no effect.</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                              | `false`  | `""`                  |
+| `upload-chunk-size`       | <ul> <li>When a non-negative number, the action uses it as the chunk size (in bytes) to split up large files during upload.</li> <li>Otherwise, the action uses the default value <code>33554432</code> (32MB).</li> </ul>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | `false`  | `""`                  |
 | `save-always`             | <p>Run the post step to save the cache even if another step before fails.</p>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | `false`  | `false`               |
 | `token`                   | <p>The action uses it to communicate with GitHub API.</p>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | `false`  | `${{ github.token }}` |
 
diff --git a/save/action.yml b/save/action.yml
index 3cba3032..57a934e7 100644
--- a/save/action.yml
+++ b/save/action.yml
@@ -79,13 +79,13 @@ inputs:
   purge-last-accessed:
     description: |
       - Can have an effect only when `purge: true`.
-      - When a number, the action purges selected caches that were last accessed more than this number of seconds ago relative to the start of the `Post Restore` phase.
+      - When a non-negative number, the action purges selected caches that were last accessed more than this number of seconds ago relative to the start of the `Post Restore` phase.
       - Otherwise, this input has no effect.
     default: ""
   purge-created:
     description: |
       - Can have an effect only when `purge: true`.
-      - When a number, the action purges caches created more than this number of seconds ago relative to the start of the `Post Restore` phase.
+      - When a non-negative number, the action purges selected caches that were created more than this number of seconds ago relative to the start of the `Post Restore` phase.
       - Otherwise, this input has no effect.
     default: ""
 
@@ -93,7 +93,7 @@ inputs:
     # The original default value may be provided here (https://github.com/actions/cache/issues/1292)
     # 32MB
     description: |
-      - When a number, the action uses it as the chunk size (in bytes) to split up large files during upload.
+      - When a non-negative number, the action uses it as the chunk size (in bytes) to split up large files during upload.
       - Otherwise, the action uses the default value `33554432` (32MB).
     default: ""