update manpage teaching about ~/.vnc/config
diff --git a/unix/vncserver.man b/unix/vncserver.man
index 04a060e..5ba6b8f 100644
--- a/unix/vncserver.man
+++ b/unix/vncserver.man
@@ -134,6 +134,14 @@
started. If this file does not exist, then vncserver will create a default
xstartup script which attempts to launch your chosen window manager.
.TP
+$HOME/.vnc/config
+An optional server config file wherein options to be passed to Xvnc are listed
+to avoid hard-coding them to the physical invocation. List options in this file
+one per line. For those requiring an argument, simply separate the option from
+the argument with an equal sign, for example: "geometry=2000x1200" or
+"securitytypes=vncauth,tlsvnc". Options without an argument are simply listed
+as a single word, for example: "localhost" or "alwaysshared".
+.TP
$HOME/.vnc/passwd
The VNC password file.
.TP