diff --git a/uncompyle6/bin/pydisassemble.py b/uncompyle6/bin/pydisassemble.py
index 4e397d48..1f11dbed 100755
--- a/uncompyle6/bin/pydisassemble.py
+++ b/uncompyle6/bin/pydisassemble.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # Mode: -*- python -*-
 #
-# Copyright (c) 2015-2016 by Rocky Bernstein <rb@dustyfeet.com>
+# Copyright (c) 2015-2016, 2018 by Rocky Bernstein <rb@dustyfeet.com>
 #
 from __future__ import print_function
 import sys, os, getopt
@@ -13,16 +13,23 @@ program, ext = os.path.splitext(os.path.basename(__file__))
 
 __doc__ = """
 Usage:
-  %s [OPTIONS]... FILE
-  %s [--help | -h | -V | --version]
+  {0} [OPTIONS]... FILE
+  {0} [--help | -h | -V | --version]
+
+Disassemble FILE with the instruction mangling that is done to
+assist uncompyle6 in parsing the instruction stream. For example
+instructions with variable-length arguments like CALL_FUNCTION and
+BUILD_LIST have arguement counts appended to the instruction name, and
+COME_FROM instructions are inserted into the instruction stream.
 
 Examples:
   {0} foo.pyc
   {0} foo.py    # same thing as above but find the file
   {0} foo.pyc bar.pyc  # disassemble foo.pyc and bar.pyc
 
+See also `pydisasm' from the `xdis' package.
+
 Options:
-  -U | --uncompyle6  show instructions with uncompyle6 mangling
   -V | --version     show version and stop
   -h | --help        show this message
 
@@ -34,8 +41,6 @@ def main():
     Usage_short = """usage: %s FILE...
 Type -h for for full help.""" % program
 
-    native = True
-
     if len(sys.argv) == 1:
         print("No file(s) given", file=sys.stderr)
         print(Usage_short, file=sys.stderr)
@@ -55,8 +60,6 @@ Type -h for for full help.""" % program
         elif opt in ('-V', '--version'):
             print("%s %s" % (program, VERSION))
             sys.exit(0)
-        elif opt in ('-U', '--uncompyle6'):
-            native = False
         else:
             print(opt)
             print(Usage_short, file=sys.stderr)
@@ -64,7 +67,7 @@ Type -h for for full help.""" % program
 
     for file in files:
         if os.path.exists(files[0]):
-            disassemble_file(file, sys.stdout, native)
+            disassemble_file(file, sys.stdout)
         else:
             print("Can't read %s - skipping" % files[0],
                   file=sys.stderr)