diff --git a/Makefile b/Makefile
index c80cec3..fe80fec 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,11 @@
+LANG ?= en-GB
+
 all:
-	./generate-html.py en-GB
-	cp -r resources output/en-GB/
+	./generate-html.py $(LANG)
+	cp -r resources output/$(LANG)/
 
 clean:
-	rm -r output/en-GB/*
+	rm -r output/$(LANG)/*
 
 serve:
-	./serve.py en-GB
+	./serve.py $(LANG)