diff --git a/doc/tools/gitwash b/doc/tools/gitwash
new file mode 160000
index 00000000..e02c2af7
--- /dev/null
+++ b/doc/tools/gitwash
@@ -0,0 +1 @@
+Subproject commit e02c2af711ff6b905a3e75f99f55e078a88e6b7e