diff --git a/metadata/layout.conf b/metadata/layout.conf
index 539ec36..d2a83fd 100644
--- a/metadata/layout.conf
+++ b/metadata/layout.conf
@@ -14,4 +14,10 @@ update-changelog = true
 # the default *is* actually pms, but better safe then sorry
 # since we don't actually need stuff like package.* as
 # directory
-profile-format = pms
+profile-formats = pms
+
+# we are on git, so we can use a fancy cache format
+# when portage-2.1.10.29 was stable for a while.
+# it defaults to pms currently. (and we currently don't distribute
+# cache anyway)
+#cache-formats = md5-dict
\ No newline at end of file