diff --git a/doc/api/milestones.md b/doc/api/milestones.md
index 92a29cee954848a73ba45e928566f15676846bc4..aa8f1bf5e02b846e588583324a96b336bef8d4ab 100644
--- a/doc/api/milestones.md
+++ b/doc/api/milestones.md
@@ -56,5 +56,5 @@ Parameters:
 + `title` (optional) - The title of a milestone
 + `description` (optional) - The description of a milestone
 + `due_date` (optional) - The due date of the milestone
-+ `closed` (optional) - The status of the milestone
++ `state_event` (optional) - The state event of the milestone (close|activate)
 
diff --git a/lib/api/milestones.rb b/lib/api/milestones.rb
index a25bbad130228fc61c1ccd261738690c7c1699fa..aee12e7dc40e7ecf66ac1c26077cc99178203cab 100644
--- a/lib/api/milestones.rb
+++ b/lib/api/milestones.rb
@@ -60,7 +60,7 @@ module API
       #   title (optional) - The title of a milestone
       #   description (optional) - The description of a milestone
       #   due_date (optional) - The due date of a milestone
-      #   state (optional) - The status of the milestone (close|activate)
+      #   state_event (optional) - The state event of the milestone (close|activate)
       # Example Request:
       #   PUT /projects/:id/milestones/:milestone_id
       put ":id/milestones/:milestone_id" do