upstream

1 files changed, 4 insertions, 1 deletions

diff --git a/lisp/server.el b/lisp/server.el
index c91f10b6584..63d46a365c9 100644
--- a/lisp/server.el
+++ b/lisp/server.el
@@ -112,7 +112,10 @@ If set, the server accepts remote connections; otherwise it is local."
 (put 'server-host 'risky-local-variable t)
 
 (defcustom server-port nil
-  "The port number that the server process should listen on."
+  "The port number that the server process should listen on.
+This variable only takes effect when the Emacs server is using
+TCP instead of local sockets.  A nil value means to use a random
+port number."
   :group 'server
   :type '(choice
           (string :tag "Port number")