diff --git a/doc/plink.but b/doc/plink.but
index 589d19ef..9f40b5fc 100644
--- a/doc/plink.but
+++ b/doc/plink.but
@@ -80,8 +80,6 @@ use Plink:
 \c   -N        don't start a shell/command (SSH-2 only)
 \c   -nc host:port
 \c             open tunnel in place of session (SSH-2 only)
-\c   -shareexists
-\c             test whether a connection-sharing upstream exists
 
 Once this works, you are ready to use Plink.