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diff --git a/README.md b/README.md
index 57ce545..25787a2 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,10 @@ Dependencies
 Pack has no runtime dependencies. The following is a list of build dependencies:
 
 -   An implementation of redo
+    -   <https://raw.githubusercontent.com/apenwarr/redo/redo-0.42d/minimal/do>
+        Copy it to the source directory, make it executable and run it. Only
+        designed for building. For development, one of the other implementations
+        is recommended.
     -   <http://news.dieweltistgarnichtso.net/bin/redo-sh.html> Tested building
         and development. Slightly overzealous rebuilds. Performance issues with
         jobserver.