diff --git a/tools/md-diff.sh b/tools/md-diff.sh
new file mode 100755
index 00000000..83cc6bcc
--- /dev/null
+++ b/tools/md-diff.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+# md-diff
+# arguments: file commit commit [diff tool with args]
+
+if [ $# -lt 3 ]; then
+	echo 'arguments: file commit commit [diff tool with args]' >&2
+	exit 1;
+fi
+
+${4:-diff} \
+	<(git show "$2:$1" | ${0%/*}/xep2md.sh -) \
+	<(git show "$3:$1"  | ${0%/*}/xep2md.sh -)