diff --git a/index.md b/index.md
index d2c031b..6f7d081 100644
--- a/index.md
+++ b/index.md
@@ -171,7 +171,8 @@ alertmanager_log_level: error
 #### Default value
 
 ```YAML
-alertmanager_packages: []
+alertmanager_packages:
+  - tar
 ```
 
 ### alertmanager_read_only_dirs