diff --git a/editor.py b/editor.py
index 0d07ec6..cf4f5c0 100644
--- a/editor.py
+++ b/editor.py
@@ -1,5 +1,12 @@
 #!/usr/bin/env python
 
+# Interactive glyph editor for Bedstead.
+#
+# This program was written by Simon Tatham in 2013.
+#
+# Simon Tatham makes this program available under the CC0 Public
+# Domain Dedication.
+
 from __future__ import division, print_function, unicode_literals
 
 import re