Mention other GraphQL directives

Reviewed By: mofeiZ

Differential Revision: D38679474

fbshipit-source-id: d70b8ac9f08fb094a75d9f0b281e93f1789d033c

website/docs/api-reference/graphql/graphql-directives.md

@@ -19,7 +19,12 @@ import {FbInternalOnly, OssOnly} from 'internaldocs-fb-helpers';
 
 Relay uses directives to add additional information to GraphQL documents, which are used by the [Relay compiler](../../guides/compiler/) to generate the appropriate runtime artifacts. These directives only appear in your application code and are removed from requests sent to your GraphQL server.
 
+<OssOnly>
 **Note:** The Relay compiler will maintain any directives supported by your server (such as `@include` or `@skip`) so they remain part of the request to the GraphQL server and won't alter generated runtime artifacts.
+</OssOnly>
+<FbInternalOnly>
+**Note:** The Relay compiler will maintain any directives supported by your server (such as `@include` or `@skip`) so they remain part of the request to the GraphQL server and won't alter generated runtime artifacts. Additional directives are documented [here](https://www.internalfb.com/intern/wiki/GraphQL/APIs_and_References/Directives/#graphql-standard).
+</FbInternalOnly>
 
 ## `@arguments`