diff --git a/README.md b/README.md
index 85c698c..5039105 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ allowing it to be served with the custom `plaintextaccounting.org` domain.
 6. Submit a pull request.
 
 [pandoc]: http://pandoc.org/installing.html
+[GNU Make]: https://www.gnu.org/software/make/
 
 ### How to get commit access