diff --git a/src/objdictgen/jsonod.py b/src/objdictgen/jsonod.py
index c0405d5..4abfa9b 100644
--- a/src/objdictgen/jsonod.py
+++ b/src/objdictgen/jsonod.py
@@ -58,12 +58,13 @@ class ValidationError(Exception):
 # 1 - Default JSON format
 JSON_ID = "od data"
 JSON_DESCRIPTION = "Canfestival object dictionary data"
+JSON_SCHEMA = "https://raw.githubusercontent.com/Laerdal/python-objdictgen/main/src/objdictgen/schema/od.schema.json"
 JSON_INTERNAL_VERSION = "0"
 JSON_VERSION = "1"
 
 # Output order in JSON file
 JSON_TOP_ORDER = (
-    "$id", "$version", "$description", "$tool", "$date", "$schema",
+    "$id", "$version", "$description", "$schema", "$tool", "$date", "$schema",
     "name", "description", "type", "id", "profile",
     "default_string_size", "dictionary",
 )
@@ -117,6 +118,7 @@ class ValidationError(Exception):
 }
 FIELDS_DATA_OPT = {
     '$description',         # info only
+    '$schema',              # info only
     '$tool',                # info only
     '$date',                # info only
     'id',                   # default 0
@@ -519,6 +521,7 @@ def node_todict(node: "Node", sort=False, rich=True, internal=False, validate=Tr
         '$id': JSON_ID,
         '$version': JSON_INTERNAL_VERSION if internal else JSON_VERSION,
         '$description': JSON_DESCRIPTION,
+        '$schema': JSON_SCHEMA,
         '$tool': str(objdictgen.ODG_PROGRAM) + ' ' + str(objdictgen.__version__),
         '$date': datetime.now().astimezone().isoformat(),
         'name': node.Name,
@@ -1167,6 +1170,7 @@ def validate_fromdict(jsonobj: TODJson, objtypes_i2s: dict[int, str], objtypes_s
     #   "type" (must)
     # Y "dictionary" (must)
     #   "$description" (optional)
+    #   "$schema" (optional)
     #   "$tool" (optional)
     #   "$date" (optional)
     #   "id" (optional, default 0)
diff --git a/src/objdictgen/schema/od.schema.json b/src/objdictgen/schema/od.schema.json
index 9277d45..1f13134 100644
--- a/src/objdictgen/schema/od.schema.json
+++ b/src/objdictgen/schema/od.schema.json
@@ -1,6 +1,6 @@
 {
     "$schema": "http://json-schema.org/draft-07/schema",
-    "$id": "https://raw.githubusercontent.com/laerdal-svg/python-objdictgen/main/src/objdictgen/schema/od.schema.json",
+    "$id": "https://raw.githubusercontent.com/Laerdal/python-objdictgen/main/src/objdictgen/schema/od.schema.json",
     "title": "Object Dictionary",
     "description": "A Object Dictionary description for canfestival",
     "type": "object",
@@ -21,6 +21,10 @@
             "description": "Description about the file",
             "type": "string"
         },
+        "$schema": {
+            "description": "The schema that this file is based on",
+            "type": "string"
+        },
         "$tool": {
             "description": "Tool that generated this file (optional)",
             "type": "string"
diff --git a/tests/od/jsonod-comments.json b/tests/od/jsonod-comments.json
index b549038..55ca5e9 100644
--- a/tests/od/jsonod-comments.json
+++ b/tests/od/jsonod-comments.json
@@ -2,8 +2,9 @@
   "$id": "od data",
   "$version": "1",
   "$description": "Canfestival object dictionary data",
-  "$tool": "odg 3.5",
-  "$date": "2024-08-13T11:36:24.609168",
+  "$schema": "https://raw.githubusercontent.com/Laerdal/python-objdictgen/main/src/objdictgen/schema/od.schema.json",
+  "$tool": "odg 3.5.1a1",
+  "$date": "2024-09-11T18:14:48.704234+02:00",
   "name": "JSON comments",
   "description": "Test for JSON comments",
   "type": "slave",
@@ -45,4 +46,4 @@
       ]
     }
   ]
-}
+}
\ No newline at end of file
diff --git a/tests/od/jsonod-comments.jsonc b/tests/od/jsonod-comments.jsonc
index 61d8c5c..1e906f7 100644
--- a/tests/od/jsonod-comments.jsonc
+++ b/tests/od/jsonod-comments.jsonc
@@ -2,8 +2,9 @@
   "$id": "od data",
   "$version": "1",
   "$description": "Canfestival object dictionary data",
-  "$tool": "odg 3.5",
-  "$date": "2024-08-13T11:36:24.609168",
+  "$schema": "https://raw.githubusercontent.com/Laerdal/python-objdictgen/main/src/objdictgen/schema/od.schema.json",
+  "$tool": "odg 3.5.1a1",
+  "$date": "2024-09-11T18:12:57.745309+02:00",
   "name": "JSON comments",
   "description": "Test for JSON comments",
   "type": "slave",
@@ -51,4 +52,4 @@
       ]
     }
   ]
-}
+}
\ No newline at end of file