diff --git a/HISTORY b/HISTORY
index 8931c5be..16c19427 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,5 +1,7 @@
 4.2.1   2018-??-??
         repmgr: add sanity check for correct extension version (Ian)
+        repmgr: ensure "witness register --dry-run" does not attempt to read node
+          tables if repmgr extension not installed; GitHub #513 (Ian)
 
 4.2     2018-10-24
         repmgr: add parameter "shutdown_check_timeout" for use by "standby switchover";