diff --git a/lib/SAML2/Const.php b/lib/SAML2/Const.php
index 79f03a642bff6893f8fde6207347c6a267685b0a..2c7a74abd0fd0b02da539e5fd99f166fb9ac9ca0 100644
--- a/lib/SAML2/Const.php
+++ b/lib/SAML2/Const.php
@@ -125,6 +125,11 @@ class SAML2_Const {
 	 */
 	const STATUS_NO_PASSIVE = 'urn:oasis:names:tc:SAML:2.0:status:NoPassive';
 
+	/**
+	 * Second-level status code for PartialLogout.
+	 */
+	const STATUS_PARTIAL_LOGOUT = 'urn:oasis:names:tc:SAML:2.0:status:PartialLogout';
+
 }
 
 ?>
\ No newline at end of file