From d53e540f6c382a2fb50edfe034305ec972303d0f Mon Sep 17 00:00:00 2001
From: crc <crc@noemail.net>
Date: Tue, 22 Sep 2020 15:54:04 +0000
Subject: [PATCH] toolchain: add comments to retro-unu.py

FossilOrigin-Name: b64bddd72a1fbf4cf3ec6c2011187fc3594722ec82d1ad0602b1b3f2d4be8779
---
 tools/retro-unu.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/retro-unu.py b/tools/retro-unu.py
index bed787d..5a4815f 100755
--- a/tools/retro-unu.py
+++ b/tools/retro-unu.py
@@ -1,5 +1,17 @@
 #!/usr/bin/env python3
 
+# retro-unu is a tool for extracting code from literate sources. It
+# will write output to stdout.
+#
+# A code block starts with ~~~ on a line by itself and ends with a
+# second ~~~.
+#
+# Copyright (c)2020, Charles Childers
+#
+# Usage:
+#
+#    retro-unu.py filename
+
 import sys
 
 if __name__ == "__main__":