Improve gulp usage

furybean · furybean · commit f95afdd08709 · 2016-05-20T13:32:55.000+08:00
diff --git a/README.md b/README.md
@@ -97,6 +97,7 @@ npm install gulp-postcss --save-dev
 Enable [Postcss salad] within your Gulpfile:
 
 ```js
+var gulp = require('gulp');
 var postcss = require('gulp-postcss');
 
 gulp.task('css', function () {
