1 files changed, 12 insertions, 0 deletions
diff --git a/src/dh_xul-ext b/src/dh_xul-ext
index 0702447..725d0b5 100755
--- a/src/dh_xul-ext
+++ b/src/dh_xul-ext
@@ -184,6 +184,18 @@ def generate_substvars(script_name, xul_apps, package, verbose=False):
 	f.writelines(lines)
 	f.close()
 
+def usage(output):
+	print >> output, """Usage: %s [options]
+
+Options:
+  -p, --package=<value>     calculate substvars only for the specified package
+
+General options:
+  -h, --help                display this help and exit
+  -v, --verbose             print more information
+
+See %s(1) for more info.""" % (sys.argv[0], os.path.basename(sys.argv[0]))
+
 if __name__ == "__main__":
 	try:
 		long_opts = ["help", "package", "verbose"]