diff --git a/docs/sources/datasources/alertmanager.md b/docs/sources/datasources/alertmanager.md
index 87c4e674555..7522fdc7daf 100644
--- a/docs/sources/datasources/alertmanager.md
+++ b/docs/sources/datasources/alertmanager.md
@@ -29,7 +29,6 @@ datasources:
     url: http://localhost:9093
     access: proxy
     jsonData:
-      implementation: 'prometheus' # alternatively 'mimir'
     # optionally
     basicAuth: true
     basicAuthUser: my_user