diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..715e624
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+.revision-hash export-subst
diff --git a/.revision-hash b/.revision-hash
new file mode 100644
index 0000000..6828f88
--- /dev/null
+++ b/.revision-hash
@@ -0,0 +1 @@
+$Format:%H$