diff --git a/README.md b/README.md
index 494195a5..fb5770ee 100644
--- a/README.md
+++ b/README.md
@@ -310,8 +310,6 @@ man pages of the applications, respectively.
        [-U]                       enable UDP relay and disable TCP relay,
                                   not available in local mode
 
-       [-A]                       enable onetime authentication
-
        [-L <addr>:<port>]         specify destination server address and port
                                   for local port forwarding,
                                   only available in tunnel mode