diff --git a/Tools/scripts/untabify.py b/Tools/scripts/untabify.py
index 1f74973..7be9f38 100755
--- a/Tools/scripts/untabify.py
+++ b/Tools/scripts/untabify.py
@@ -15,8 +15,11 @@
             raise getopt.error, "At least one file argument required"
     except getopt.error, msg:
         print msg
-        print "usage:", sys.argv[0], "file ..."
+        print "usage:", sys.argv[0], "[-t tabwidth] file ..."
         return
+    for optname, optvalue in opts:
+        if optname == '-t':
+            tabsize = int(optvalue)
 
     for file in args:
         process(file, tabsize)