diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ca4223b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+metadata/cache
+metadata/md5-cache
diff --git a/metadata/layout.conf b/metadata/layout.conf
index d43e61c..c1c568d 100644
--- a/metadata/layout.conf
+++ b/metadata/layout.conf
@@ -1 +1,4 @@
 masters = gentoo
+
+cache-formats = md5-dict
+thin-manifests = true