diff --git a/samples/Makefile b/samples/Makefile
index 72074e82b..3cf199f28 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -1,6 +1,8 @@
 #
 # Makefile for cc65 samples
 #
+# This Makefile requires GNU make
+#
 
 # Enter the target system here
 SYS	= c64