diff --git a/doc/misc/options b/doc/misc/options
index 30efdbc603..1d5533b824 100644
--- a/doc/misc/options
+++ b/doc/misc/options
@@ -133,6 +133,7 @@ options {
         listen-on [ port <integer> ] { <address_match_element>; ... };
         listen-on-v6 [ port <integer> ] { <address_match_element>; ... };
         maintain-ixfr-base <boolean>; // obsolete
+        managed-keys-directory <quoted_string>;
         masterfile-format ( text | raw );
         match-mapped-addresses <boolean>;
         max-acache-size <size_no_default>;