diff --git a/users/syncthing.rst b/users/syncthing.rst
index 91a908733..f64bdb103 100644
--- a/users/syncthing.rst
+++ b/users/syncthing.rst
@@ -6,8 +6,7 @@ Synopsis
 
 ::
 
-    syncthing [-audit] [-generate=<dir>] [-gui-address=<address>]
-              [-gui-apikey=<key>] [-gui-authentication=<username:password>]
+    syncthing [-audit] [-generate=<dir>] [-gui-address=<address>] [-gui-apikey=<key>]
               [-home=<dir>] [-logfile=<filename>] [-logflags=<flags>] [-no-browser]
               [-no-console] [-no-restart] [-reset] [-upgrade] [-upgrade-check]
               [-upgrade-to=<url>] [-verbose] [-version]
@@ -41,10 +40,6 @@ Options
 
     Override GUI API key.
 
-.. cmdoption:: -gui-authentication=<username:password>
-
-    Override GUI authentication; username:password.
-
 .. cmdoption:: -home=<dir>
 
     Set configuration directory. The default configuration directory is: