diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..6b2abdec
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+.tag                    export-subst
+.gitattributes          export-ignore
+.gitignore              export-ignore
diff --git a/.tag b/.tag
new file mode 100644
index 00000000..6828f88d
--- /dev/null
+++ b/.tag
@@ -0,0 +1 @@
+$Format:%H$