diff --git a/dev/README.md b/dev/README.md
index 211728565e..cfee5419e8 100644
--- a/dev/README.md
+++ b/dev/README.md
@@ -7,22 +7,38 @@ The tests in this directory are run in the `framework_tests_misc-*`
 shards.
 
 ## Luci builder file
-`try_builders.json` and `prod_builders.json` contain the
-supported luci try/prod builders for engine. They follow format:
+`try_builders.json` and `prod_builders.json` contain the supported luci
+try/prod builders for flutter.
+### `try_builders.json`
+It follows format:
 ```json
 {
     "builders":[
         {
-            "name":"xxx1",
-            "repo":"flutter"
-        },
-        {
-            "name":"xxx2",
+            "name":"yyy",
             "repo":"flutter",
-            "taskName":"yyy2"
+            "taskName":"zzz",
+            "enabled":true
         }
     ]
 }
 ```
-These files will be mainly used in [`flutter/cocoon`](https://github.com/flutter/cocoon)
-to trigger/update flutter luci tasks.
+* enabled(optional): `true` is the default value if unspecified
+### `prod_builders.json`
+It follows format:
+```json
+{
+    "builders":[
+        {
+            "name":"yyy",
+            "repo":"flutter",
+            "taskName":"zzz",
+            "flaky":false
+        }
+    ]
+}
+```
+`try_builders.json` will be mainly used in
+[`flutter/cocoon`](https://github.com/flutter/cocoon) to trigger/update pre-submit
+flutter luci tasks, whereas `prod_builders.json` will be mainly used in `flutter/cocoon`
+to refresh luci task statuses to [dashboard](https://flutter-dashboard.appspot.com).
diff --git a/dev/try_builders.json b/dev/try_builders.json
index 80af1e3035..a281b38432 100644
--- a/dev/try_builders.json
+++ b/dev/try_builders.json
@@ -3,39 +3,44 @@
       {
          "name":"Linux build_tests",
          "repo":"flutter",
-         "taskName":"build_tests"
+         "taskName":"build_tests",
+         "enabled":true
       },
       {
          "name":"Linux framework_tests",
          "repo":"flutter",
-         "taskName":"linux_framework_tests"
+         "taskName":"linux_framework_tests",
+         "enabled":true
       },
       {
          "name":"Linux hostonly_devicelab_tests",
          "repo":"flutter",
-         "taskName":"hostonly_devicelab_tests"
+         "taskName":"hostonly_devicelab_tests",
+         "enabled":true
       },
       {
          "name":"Linux tool_tests",
          "repo":"flutter",
-         "taskName":"tool_tests"
+         "taskName":"tool_tests",
+         "enabled":true
       },
       {
          "name":"Linux web_tests",
          "repo":"flutter",
-         "taskName":"web_tests"
+         "taskName":"web_tests",
+         "enabled":true
       },
       {
          "name": "Windows build_tests",
          "repo": "flutter",
          "task_name": "win_build_tests",
-         "flaky": false
+         "enabled":true
       },
       {
          "name": "Windows framework_tests",
          "repo": "flutter",
          "task_name": "win_framework_tests",
-         "flaky": false
+         "enabled":true
       }
    ]
-}
+}
\ No newline at end of file