diff --git a/specification/cognitiveservices/data-plane/CustomSearch/stable/v1.0/CustomSearch.json b/specification/cognitiveservices/data-plane/CustomSearch/stable/v1.0/CustomSearch.json
index c8a3f48ab3b6..6d63996e9ef8 100644
--- a/specification/cognitiveservices/data-plane/CustomSearch/stable/v1.0/CustomSearch.json
+++ b/specification/cognitiveservices/data-plane/CustomSearch/stable/v1.0/CustomSearch.json
@@ -101,7 +101,7 @@
 						"x-ms-client-name": "CustomConfig",
 						"in": "query",
 						"description": "The identifier for the custom search configuration",
-						"required": false,
+						"required": true,
 						"type": "integer",
 						"format": "int32"
 					},