diff --git a/README.md b/README.md
index 375d9db..e7a3bbe 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ import { CustomError } from 'ts-custom-error'
 class HttpError extends CustomError {
 	public constructor(
 		public code: number,
-		message: string = HttpError.messages[code],
+		message?: string,
 	) {
 		super(message)
 	}
@@ -30,3 +30,14 @@ import { factory } from 'ts-custom-error'
 
 const MyError = factory('MyError', { message: 'foo', code: 42 })
 ```
+
+## Similar packages
+- [![custom-error](https://badge.fury.io/js/custom-error.svg)](https://www.npmjs.com/package/custom-error) [custom-error](https://github.com/andrezsanchez/custom-error)
+- [![custom-errors](https://badge.fury.io/js/custom-errors.svg)](https://www.npmjs.com/package/custom-errors) [custom-errors](https://github.com/techjacker/custom-errors)
+- [![custom-error-generator](https://badge.fury.io/js/custom-error-generator.svg)](https://www.npmjs.com/package/custom-error-generator) [custom-error-generator](https://github.com/jproulx/node-custom-error)
+- [![custom-error-instance](https://badge.fury.io/js/custom-error-instance.svg)](https://www.npmjs.com/package/custom-error-instance) [custom-error-instance](https://github.com/Gi60s/custom-error-instance)
+- [![node-custom-errors](https://badge.fury.io/js/node-custom-errors.svg)](https://www.npmjs.com/package/node-custom-errors) [node-custom-errors](https://github.com/axyjs/node-custom-errors)
+- [![extendable-error](https://badge.fury.io/js/extendable-error.svg)](https://www.npmjs.com/package/extendable-error) [extendable-error](https://github.com/vilic/extendable-error)
+- [![extendable-error-class](https://badge.fury.io/js/extendable-error-class.svg)](https://www.npmjs.com/package/extendable-error-class) [extendable-error-class](https://github.com/brillout/extendable-error-class)
+- [![extend-error](https://badge.fury.io/js/extend-error.svg)](https://www.npmjs.com/package/extend-error) [extend-error](https://github.com/jayyvis/extend-error)
+- [![error-extend](https://badge.fury.io/js/eerror-extend.svg)](https://www.npmjs.com/package/error-extend) [error-extend](https://github.com/tilap/error-extend)
diff --git a/package.json b/package.json
index 62f20c2..9d3ac62 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "test": "jest --notify",
     "coverage": "jest --coverage",
     "pretty": "prettier --use-tabs --no-semi --single-quote --trailing-comma all --write src/* src/*/*",
-    "precommit": "lint-staged && npm test",
+    "precommit": "lint-staged && npm test -- --onlyChanged",
     "prepublishOnly": "npm test && npm run bundle"
   },
   "lint-staged": {