diff --git a/lib/hdb/hdb.h b/lib/hdb/hdb.h
index a5e6514e6..d67bd16f2 100644
--- a/lib/hdb/hdb.h
+++ b/lib/hdb/hdb.h
@@ -54,6 +54,7 @@ enum hdb_lockop{ HDB_RLOCK, HDB_WLOCK };
 #define HDB_F_GET_ANY		28	/* fetch any of client,server,krbtgt */
 #define HDB_F_CANON		32	/* want canonicalition */
 
+/* hdb_capability_flags */
 #define HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL 1
 
 /* key usage for master key */