diff --git a/CVS_README b/CVS_README
index 335b8fd..f39fc79 100644
--- a/CVS_README
+++ b/CVS_README
@@ -17,7 +17,8 @@ CVS repository.
 During the build process a number of auto-generated files not included
 in the CVS repository are built. It is highly recommended to follow
 these instructions carefully as otherwise incompatible versions of
-generated files may result.
+generated files may result. Note that you need GNU make for this
+process.
 
 To build Scsh, proceed as follows: