diff --git a/cloudevents/extensions/deprecation.md b/cloudevents/extensions/deprecation.md
index 85d6f97d..05bda3ec 100644
--- a/cloudevents/extensions/deprecation.md
+++ b/cloudevents/extensions/deprecation.md
@@ -27,7 +27,6 @@ extension is being used.
   `false` if not specified.
 - Constraints
   - OPTIONAL
-  - The value MUST be a boolean (`true` or `false`).
 - Example: `"deprecated": "true"`
 
 ### deprecationfrom