diff --git a/README.md b/README.md
index a0ff05043..daec12a6d 100644
--- a/README.md
+++ b/README.md
@@ -320,7 +320,7 @@ Configures the service for using SSL.
 ####`ssl_only`
 
 Configures the service to only use SSL.  No cleartext TCP listeners will be created.
-Requires that ssl => true also.
+Requires that ssl => true and port => UNSET also
 
 ####`ssl_cacert`