Document the -list argument to vncserver
diff --git a/unix/vncserver.man b/unix/vncserver.man
index dceaa79..649d2c4 100644
--- a/unix/vncserver.man
+++ b/unix/vncserver.man
@@ -19,6 +19,8 @@
 .RI [ Xvnc-options... ]
 .br
 .BI "vncserver \-kill :" display#
+.br
+.BI "vncserver \-list"
 .SH DESCRIPTION
 .B vncserver
 is used to start a VNC (Virtual Network Computing) desktop.
@@ -120,6 +122,10 @@
 this has the effect of terminating Xvnc when the user logs out of the window
 manager.
 
+.TP
+.B \-list
+Lists all VNC desktops started by vncserver.
+
 .SH FILES
 Several VNC-related files are found in the directory $HOME/.vnc:
 .TP