diff --git a/files/en-us/web/manifest/index.md b/files/en-us/web/manifest/index.md
index f797bc62b14fcce..b2fd526ef52a9a2 100644
--- a/files/en-us/web/manifest/index.md
+++ b/files/en-us/web/manifest/index.md
@@ -21,6 +21,8 @@ All members are optional in the specification, but some applications require som
 
 {{ListSubpages("/en-US/docs/Web/Manifest")}}
 
+> **Note:** The `dir`, `lang`, `iarc_rating_id`, and `note_taking` members are not implemented.
+
 ## Example manifest
 
 ```json