diff --git a/make-package b/make-package
index 2c55199cea889001198ecb1327699f1bb06a97d4..8ea5169ee1e034e6142b6ab8d3e3c4f74d0756ff 100755
--- a/make-package
+++ b/make-package
@@ -3,6 +3,8 @@ set -e
 # Helper script to build and/or install just one package out of this repository.
 # Assumes that all the other packages it depends on have been installed already!
 
+# Make sure we get a GNU version of make.
+# This is exactly how opam determines which make executable to use.
 OS=$(uname)
 MAKE="make"
 if [ $OS == "FreeBSD" ] || [ $OS == "OpenBSD" ] ||\