diff --git a/README.md b/README.md
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+++ b/README.md
@@ -163,6 +163,8 @@ make install</code>
 It is a really bad idea to break this Code of Conduct *even if* no one
 complains about your behavior.
 
+md5sum: 42b9be967d638069789e5d830b8a8f93
+
 ### Contributor Guide
 
 Contributing is easy: