Update IETF-RFC.md

Co-authored-by: Giuseppe Lo Presti <[email protected]>

Author: mickenordin

IETF-RFC.md

@@ -688,7 +688,8 @@ contain the following information about its OCM API:
   Page SHOULD redirect the end-user to
 `/index.php/apps/sciencemesh/accept?token=zi5kooKu3ivohr9a&providerDomain=example.com`.
 * OPTIONAL: tokenEndPoint (string) - URL of the token endpoint where
-  the Sending Server can exchange a `code` for a bearer token.
+  the Sending Server can exchange a `code` for a bearer token,
+  according to the Open ID Connect semantic [RFC6749] [OIDC].
   Implementations that offer the `"receive-code"` capability MUST
   provide this URL as well.
   Example: `"https://my-cloud-storage.org/ocm/token"`.