README: add section about mailing list

README

diff --git a/README b/README
index f9ed44b..4f8498a 100644
--- a/README
+++ b/README
@@ -4,6 +4,12 @@
 Fix common misspellings in text files. It's designed primarily for checking
 misspelled words in source code, but it can be used with other files as well.
 
+MAILING LIST
+============
+
+codespell has a public mailing list: codespell@googlegroups.com. Register to
+the mailing list if you don't want your email to be moderated.
+
 USAGE
 =====