diff --git a/README.md b/README.md
index 920350d..12298e5 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,7 @@ For the detailed documentation go to [**https://error.angular-package.dev**](htt
 * [Skeleton](#skeleton)
 * [Installation](#installation)
 * [Changelog](#changelog)
+* [Api](#api)
 * [Git](#git)
   * [Commit](#commit)
   * [Versioning](#versioning)
@@ -75,18 +76,17 @@ For the detailed documentation go to [**https://error.angular-package.dev**](htt
 
 ## Skeleton
 
-This package was built by the [library skeleton][skeleton] which was generated with [Angular CLI](https://github.com/angular/angular-cli) version 12.2.5.
-
-Copy this package to the `packages/error` folder of the [library skeleton][skeleton] then run the commands below.
+The package was generated by the [library skeleton][skeleton] which was generated with [Angular CLI](https://github.com/angular/angular-cli) version 13.0.0.
+Copy package to the `packages/error` folder of the [library skeleton][skeleton] then run the commands below.
 
 ### Code scaffolding
 
-Run `ng generate component component-name --project error` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module --project storage`.
+Run `ng generate component component-name --project error` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module --project error`.
 > Note: Don't forget to add `--project error` or else it will be added to the default project in your `angular.json` file.
 
 ### Build
 
-Run `ng build error` to build the package. The build artifacts will be stored in the `dist/` directory.
+Run `ng build error` to build the package. The build artifacts will be stored in the `dist/error` directory.
 
 ### Publishing
 
@@ -94,10 +94,10 @@ After building your library with `ng build error`, go to the dist folder `cd dis
 
 ### Running unit tests
 
-Install `@angular-package/testing` with command:
+Before the test can be performed install `@angular-package/testing` and `@angular-package/type` with command:
 
 ```typescript
-npm i @angular-package/testing --no-save
+npm i @angular-package/testing @angular-package/type --no-save
 ```
 
 Run `ng test error` to execute the unit tests via [Karma](https://karma-runner.github.io).
@@ -114,6 +114,26 @@ npm i @angular-package/error --save
 
 <br>
 
+## Api
+
+```typescript
+import {
+  // Class.
+  CommonError,
+  CommonErrors,
+  Error,
+  Errors,
+  RangeError,
+  RangeErrors,
+  TypeError,
+  TypeErrors,
+  ValidationError,
+  ValidationErrors
+} from '@angular-package/error';
+```
+
+<br>
+
 ## Changelog
 
 The **changelog** of this package is based on [*keep a changelog*](https://keepachangelog.com/en/1.0.0/). To read it, click on the [CHANGELOG.md](https://github.com/angular-package/error/blob/main/CHANGELOG.md) link.