diff --git a/yang/ietf-acl-enh.yang b/yang/ietf-acl-enh.yang
index e105b0c..d14fedb 100644
--- a/yang/ietf-acl-enh.yang
+++ b/yang/ietf-acl-enh.yang
@@ -1053,7 +1053,7 @@ module ietf-acl-enh {
               "I-SID number along with the operator on which to
                match.";
             reference
-              "IEEE 802.1ah: Provider Backbone Bridges"
+              "IEEE 802.1ah: Provider Backbone Bridges";
           }
         }
       }