diff --git a/README.md b/README.md
index 85949e0..2a25e67 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,7 @@ Set up a [percona-server](https://www.percona.com/software/mysql-database/percon
 ##### General
 
 * `percona_server_version`: [default: `5.7`]: Version to install (e.g. `5.6`)
+* `percona_server_root_username`: [default: `root`]: Root username
 * `percona_server_root_password`: [default: `+eswuw9uthUteFreyAqu`]: Root password **Make sure to change!**
 
 * `percona_server_install`: [`['xtrabackup']`]: Additional packages to install