fixes #19429: mention grunt tasks in local dev in readme

diff --git a/README.md b/README.md
index 201128d4aae075d20ab82322eee9f39f7be34559..1f027087a14cbbb4fc1831fd7d4aa42521ae45c4 100644 (file)
--- a/README.md
+++ b/README.md
@@ -71,8 +71,9 @@ Bootstrap's documentation, included in this repo in the root directory, is built
 ### Running documentation locally
 
 1. Run through the [tooling setup](https://github.com/twbs/bootstrap/blob/v4-dev/docs/getting-started/build-tools.md#tooling-setup) to install Jekyll (the site builder) and other Ruby dependencies with `bundle install`.
-2. From the root `/bootstrap` directory, run `bundle exec jekyll serve` in the command line.
-3. Open <http://localhost:9001> in your browser, and voilà.
+2. Run `grunt` (or a specific set of Grunt tasks) to rebuild distributed CSS and JavaScript files, as well as our docs assets.
+3. From the root `/bootstrap` directory, run `bundle exec jekyll serve` in the command line.
+4. Open <http://localhost:9001> in your browser, and voilà.
 
 Learn more about using Jekyll by reading its [documentation](http://jekyllrb.com/docs/home/).