diff --git a/routers/api/v1/repo/collaborators.go b/routers/api/v1/repo/collaborators.go
index a43a21a88e..9ef1a92be4 100644
--- a/routers/api/v1/repo/collaborators.go
+++ b/routers/api/v1/repo/collaborators.go
@@ -82,6 +82,7 @@ func IsCollaborator(ctx *context.APIContext) {
 	// swagger:operation GET /repos/{owner}/{repo}/collaborators/{collaborator} repository repoCheckCollaborator
 	// ---
 	// summary: Check if a user is a collaborator of a repository
+	// description: If the user is a collaborator, return 204. If the user is not a collaborator, return 404.
 	// produces:
 	// - application/json
 	// parameters:
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index 2a8252557e..0d8497ca75 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -6074,6 +6074,7 @@
     },
     "/repos/{owner}/{repo}/collaborators/{collaborator}": {
       "get": {
+        "description": "If the user is a collaborator, return 204. If the user is not a collaborator, return 404.",
         "produces": [
           "application/json"
         ],