PR complete a task

Change-Id: Icb3f24db0ccd2914a528370d96b8c21168b24e98
diff --git a/server/tm/git_tm/git_task_manager.go b/server/tm/git_tm/git_task_manager.go
index a49a866..f7d7a07 100644
--- a/server/tm/git_tm/git_task_manager.go
+++ b/server/tm/git_tm/git_task_manager.go
@@ -1103,7 +1103,7 @@
 		cleanTitle = cleanTitle[:40]
 	}
 
-	return fmt.Sprintf("%s/%s-%s", prefix, task.ID, cleanTitle)
+	return fmt.Sprintf("%s/[%s]-%s", prefix, task.ID, cleanTitle)
 }
 
 // buildSolutionPRDescription creates PR description from template