diff --git a/config/makefile b/config/makefile
index 03316e4..7e8db1d 100644
--- a/config/makefile
+++ b/config/makefile
@@ -1,3 +1,5 @@
+# requires ZMK_APP_DIR (.../zmk/app) and ZMK_CONFIG (.../zmk-config/config)
+
 
 .PHONY: default
 default: corne