diff --git a/.gitignore b/.gitignore
index dc6aa150..f699d161 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,5 @@ npm-debug.log
 yarn.lock
 test/fixtures/egg/node_modules/egg-core
 .idea
-.nyc_output
\ No newline at end of file
+.nyc_output
+package-lock.json
diff --git a/lib/egg.js b/lib/egg.js
index b5edf430..39ce1a87 100644
--- a/lib/egg.js
+++ b/lib/egg.js
@@ -201,7 +201,14 @@ class EggCore extends KoaApplication {
   }
 
   /**
-   * Execute scope after loaded and before app start
+   * Execute scope after loaded and before app start.
+   *
+   * Notice:
+   * This method is now NOT recommanded and reguarded as a deprecated one,
+   * For plugin development, we should use `didLoad` instead.
+   * For application development, we should use `willReady` instead.
+   *
+   * @see https://eggjs.org/en/advanced/loader.html#beforestart
    *
    * @param  {Function|GeneratorFunction|AsyncFunction} scope function will execute before app start
    */
@@ -249,8 +256,16 @@ class EggCore extends KoaApplication {
   }
 
   /**
-   * Register a function that will be called when app close
-   * @param {Function} fn - the function that can be generator function or async function
+   * Register a function that will be called when app close.
+   *
+   * Notice:
+   * This method is now NOT recommanded directly used,
+   * Developers SHOULDN'T use app.beforeClose directly now,
+   * but in the form of class to implement beforeClose instead.
+   *
+   * @see https://eggjs.org/en/advanced/loader.html#beforeclose
+   *
+   * @param {Function} fn - the function that can be generator function or async function.
    */
   beforeClose(fn) {
     this.lifecycle.registerBeforeClose(fn);
@@ -317,13 +332,13 @@ class EggCore extends KoaApplication {
    * @param  {Function} fn The inputted function.
    * @return {AsyncFunction} An async promise-based function.
    * @example
-   * ```javascript
-   *  const fn = function* (arg) {
+    ```javascript
+     const fn = function* (arg) {
         return arg;
       };
       const wrapped = app.toAsyncFunction(fn);
       wrapped(true).then((value) => console.log(value));
-   * ```
+    ```
    */
   toAsyncFunction(fn) {
     if (!is.generatorFunction(fn)) return fn;
@@ -338,14 +353,14 @@ class EggCore extends KoaApplication {
    * @param  {Mixed} obj The inputted object.
    * @return {Promise} A Promisable result.
    * @example
-   * ```javascript
-   *  const fn = function* (arg) {
+    ```javascript
+     const fn = function* (arg) {
         return arg;
       };
       const arr = [ fn(1), fn(2) ];
       const promise = app.toPromise(arr);
       promise.then(res => console.log(res));
-   * ```
+    ```
    */
   toPromise(obj) {
     return co(function* () {
diff --git a/lib/lifecycle.js b/lib/lifecycle.js
index 527de8e5..a5a82d90 100644
--- a/lib/lifecycle.js
+++ b/lib/lifecycle.js
@@ -6,7 +6,6 @@ const getReady = require('get-ready');
 const { Ready } = require('ready-callback');
 const { EventEmitter } = require('events');
 const debug = require('debug')('egg-core:lifecycle');
-
 const INIT = Symbol('Lifycycle#init');
 const INIT_READY = Symbol('Lifecycle#initReady');
 const DELEGATE_READY_EVENT = Symbol('Lifecycle#delegateReadyEvent');
@@ -83,7 +82,7 @@ class Lifecycle extends EventEmitter {
 
   addFunctionAsBootHook(hook) {
     assert(this[INIT] === false, 'do not add hook when lifecycle has been initialized');
-    // app.js is export as a funciton
+    // app.js is exported as a function
     // call this function in configDidLoad
     this[BOOT_HOOKS].push(class Hook {
       constructor(app) {
diff --git a/test/loader/file_loader.test.js b/test/loader/file_loader.test.js
index 3da37eec..47bfe89d 100644
--- a/test/loader/file_loader.test.js
+++ b/test/loader/file_loader.test.js
@@ -118,7 +118,7 @@ describe('test/loader/file_loader.test.js', () => {
     assert.deepEqual(instance.getUser(), { name: 'xiaochen.gaoxc' });
   });
 
-  it.skip('should only load property match the filers', () => {
+  it('should only load property match the filers', () => {
     const app = { middlewares: {} };
     new FileLoader({
       directory: [