diff --git a/Makefile.doc b/Makefile.doc
new file mode 100644
index 0000000..160dad0
--- /dev/null
+++ b/Makefile.doc
@@ -0,0 +1,2 @@
+puzzles.hlp puzzles.txt: puzzles.but
+	halibut --winhelp=puzzles.hlp --text=puzzles.txt puzzles.but