link pr

Author: spawnia

CHANGELOG.md

@@ -13,7 +13,7 @@ You can find and compare releases at the [GitHub release page](https://github.co
 
 ### Fixed
 
-- Make querying `isOneOf` optional in Introspection query
+- Make querying `isOneOf` optional in Introspection query https://github.com/webonyx/graphql-php/pull/1737
 
 ## v15.21.2