diff --git a/readme.md b/readme.md
index db7363f..ea5834f 100644
--- a/readme.md
+++ b/readme.md
@@ -8,7 +8,7 @@
 ## Install
 
 ```
-$ npm install --save-dev gulp-babel babel-preset-env
+$ npm install --save-dev gulp-babel babel-core babel-preset-env
 ```