diff --git a/lisp/net/ldap.el b/lisp/net/ldap.el
index 3838b2ec616..786cfa976b4 100644
--- a/lisp/net/ldap.el
+++ b/lisp/net/ldap.el
@@ -39,6 +39,7 @@
 
 (defgroup ldap nil
   "Lightweight Directory Access Protocol."
+  :version "21.1"
   :group 'comm)
 
 (defcustom ldap-default-host nil