diff --git a/doc/environments/groupthm/Makefile b/doc/environments/groupthm/Makefile
new file mode 100644
index 0000000..0e9ec61
--- /dev/null
+++ b/doc/environments/groupthm/Makefile
@@ -0,0 +1,12 @@
+all: clean pdf
+
+pdf:
+	pdflatex groupthm.dtx
+
+clean:
+	latexmk -c groupthm.dtx
+	rm -f groupthm.hd
+	rm -f groupthm.glo
+	rm -f groupthm.pdf
+
+.PHONY: pdf clean