diff --git a/offlineimap.conf b/offlineimap.conf
index b0ef554..27962d3 100644
--- a/offlineimap.conf
+++ b/offlineimap.conf
@@ -773,6 +773,8 @@ remoteuser = username
 # This option is disabled by default to retain compatibility with older versions
 # of offlineimap.
 #
+# This option is EXPERIMENTAL.
+#
 #decodefoldernames = no