diff --git a/entry/src/main/cpp/napi_init.cpp b/entry/src/main/cpp/napi_init.cpp
index b650e1dd26f6c575754338e8589f86dbae76f96b..3f4dbd998f9158347d68c2b28000f5ef544c446a 100644
--- a/entry/src/main/cpp/napi_init.cpp
+++ b/entry/src/main/cpp/napi_init.cpp
@@ -102,9 +102,10 @@ static napi_value ThreadSafeCase(napi_env env, napi_callback_info info) {
 // [End thread_safe_case]
 
 // [Start uv_loop_async]
+//Global variable, used to store loop information and async handle.
 uv_loop_t *loop = nullptr;
 uv_async_t *async = nullptr;
-// [End uv_loop_async_t]
+// [End uv_loop_async]
 
 // [Start async_handler]
 void async_handler(uv_async_t *handle) {
diff --git a/entry/src/main/ets/pages/Index.ets b/entry/src/main/ets/pages/Index.ets
index adbf7f1e6f216c607c314de7a48d5fb4945b6830..c3d7812f464376fa3cf9027500a46d6e377b182b 100644
--- a/entry/src/main/ets/pages/Index.ets
+++ b/entry/src/main/ets/pages/Index.ets
@@ -63,9 +63,10 @@ struct Index {
           .width('100%')
           .onClick(() => {
             // [Start testNapi_thread_safe_case]
+            //Call Native side function and pass ArkTS side function to Native side.
             testNapi.threadSafeCase(this.work);
-            this.getUIContext().getPromptAction().showToast({
             // [End testNapi_thread_safe_case]
+            this.getUIContext().getPromptAction().showToast({
               message: $r('app.string.threadSafe_message'),
               duration: 2000
             })
@@ -74,7 +75,10 @@ struct Index {
           .width('100%')
           .margin({ top: 12 })
           .onClick(() => {
+            // [Start lib_case]
+            //Call Native side function and pass ArkTS side function to Native side.
             testNapi.libUvCase(this.work);
+            // [End lib_case]
             this.getUIContext().getPromptAction().showToast({
               message: $r('app.string.libUV_message'),
               duration: 2000