diff --git a/servers/slapd/overlays/sssvlv.c b/servers/slapd/overlays/sssvlv.c
index 543d00f2c180b2354878121e1c73fa572d46342a..ec43fb87bdf16b491071ac976f140f835c9e85f8 100644
--- a/servers/slapd/overlays/sssvlv.c
+++ b/servers/slapd/overlays/sssvlv.c
@@ -1076,6 +1076,9 @@ static int build_key(
 	return rs->sr_err;
 }
 
+/* Conforms to RFC4510 re: Criticality, original RFC2891 spec is broken
+ * Also see ITS#7253 for discussion
+ */
 static int sss_parseCtrl(
 	Operation		*op,
 	SlapReply		*rs,