Document the --verbose switch.

diff --git a/tools/wrc/wrc.man b/tools/wrc/wrc.man
index 4e1d70f..6a0a74f 100644
--- a/tools/wrc/wrc.man
+++ b/tools/wrc/wrc.man
@@ -111,7 +111,7 @@
 .I \fB\-\-use\-temp\-file\fR
 Ignored for compatibility with \fIwindres\fR.
 .TP
-.I \fB\-v\fR
+.I \fB\-v\fR, \fB\-\-verbose\fR
 Turns on verbose mode (equivalent to -d 1).
 .TP
 .I \fB\-\-version\fR