diff --git a/README.md b/README.md
index 9b0b2133b0..3d9dc7f60c 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ Bootstrap's documentation, included in this repo in the `/docs` directory, is bu
 
 ### Running documentation locally
 
-1. If necessary, [install Jekyll](http://jekyllrb.com/docs/installation).
+1. If necessary, [install Jekyll](http://jekyllrb.com/docs/installation) (requires v1.x).
 2. From the `/bootstrap` directory, run `jekyll serve` in the command line.
 3. Open [http://localhost:9001](http://localhost:9001) in your browser, and voilà.