diff --git a/src/schemas/validation/schema.yaml b/src/schemas/validation/schema.yaml
index 70ce22b1a8..c22ab84cf0 100644
--- a/src/schemas/validation/schema.yaml
+++ b/src/schemas/validation/schema.yaml
@@ -618,8 +618,8 @@ $defs:
     type: object
     properties:
       contentType:
+        $comment: one or more comma-separated media-ranges
         type: string
-        format: media-range
       headers:
         type: object
         propertyNames: