diff --git a/src/ifcopenshell-python/Makefile b/src/ifcopenshell-python/Makefile
index bca9c22d47..1e929185de 100644
--- a/src/ifcopenshell-python/Makefile
+++ b/src/ifcopenshell-python/Makefile
@@ -68,6 +68,7 @@ IFCCONVERT_URL:=https://s3.amazonaws.com/ifcopenshell-builds/IfcConvert-v$(BINAR
 
 .PHONY: build-urls
 build-urls:
+	@echo "You can provide one of the 4 platforms (linux64, macos64, macosm164, win64) using `PLATFORM=xxx`."
 	@echo ${IOS_URL}
 	@echo ${IFCCONVERT_URL}