documented -W option

docs/manpages/smbclient.1

@@ -36,6 +36,9 @@ smbclient \- ftp-like Lan Manager client program
 .B -n
 .I netbios name
 ] [
+.B -W
+.I workgroup
+] [
 .B -O
 .I socket options
 ] [
@@ -323,6 +326,14 @@ uppercase) as its netbios name. This parameter allows you to override
 the host name and use whatever netbios name you wish.
 .RE
 
+.B -W
+.I workgroup
+
+.RS 3
+Override what workgroup is used for the connection. This may be needed
+to connect to some servers.
+.RE
+
 .B -p
 .I port number
 .RS 3