diff --git a/README.md b/README.md
index 511a9e4..942a275 100644
--- a/README.md
+++ b/README.md
@@ -277,6 +277,10 @@ Sets the initial Java heap size (-Xms) for Graylog. Defaults to `1g`.
 
 Sets the maximum Java heap size (-Xmx) for Graylog. Defaults to `1g`.
 
+##### `restart_on_package_upgrade`
+
+This setting restarts the `graylog-server` service if the os package is upgraded.
+It defaults to `false`.
 
 #### Class: graylog::allinone