diff -u b/plugins/openid_connect_client/generic/OpenIDConnectClientGeneric.class.php b/plugins/openid_connect_client/generic/OpenIDConnectClientGeneric.class.php
--- b/plugins/openid_connect_client/generic/OpenIDConnectClientGeneric.class.php
+++ b/plugins/openid_connect_client/generic/OpenIDConnectClientGeneric.class.php
@@ -59,8 +59,8 @@
   /**
    * End User Session in IdP
    *
-   * @see http://openid.net/specs/openid-connect-session-1_0-15.html
-   * @see http://openid.net/specs/openid-connect-session-1_0-15.html#RPLogout
+   * @see https://openid.net/specs/openid-connect-session-1_0-28.html
+   * @see https://openid.net/specs/openid-connect-session-1_0-28.html#RedirectionAfterLogout
    *
    * @param $id_token
    *   A NON-expired id_token (RECOMMENDED)