diff --git a/README.rst b/README.rst
index b89a4cc..653a21d 100644
--- a/README.rst
+++ b/README.rst
@@ -30,6 +30,7 @@
               arch: [ 'amd64' ]
               mirror_host: "mirror.mirantis.com" # rsync
               mirror_root: ':mirror/nightly/ubuntu/'
+              cache_dir: "/var/www/mirror/.cache/ubuntu"
               target_dir: "/var/www/mirror/ubuntu/"
               log_file: "/var/www/mirror/target01_log.log"
               dist: [ xenial ] #, xenial-security, xenial-updates ]
@@ -46,3 +47,7 @@
                 07: "--include='/main(.*)manpages'"
                 08: "--include='/main(.*)python-(.*)doc'"
                 09: "--include='/main(.*)python-(.*)network'"
+
+Parameter cache_dir is optional and can be used to avoid extra disk space
+usage for repos, which can have same packages, by using hardlinks to files.
+