diff --git a/.github/workflows/unix.yml b/.github/workflows/unix.yml
index d1996164..25d42601 100644
--- a/.github/workflows/unix.yml
+++ b/.github/workflows/unix.yml
@@ -3,7 +3,7 @@ name: Unix
 on:
   push:
   pull_request:
-  # Run daily at midnight.
+  # Run daily at midnight (UTC).
   schedule:
     - cron: '0 0 * * *'