diff --git a/.gitignore b/.gitignore
index 29ceb64d5..2f298001f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ coverage/
 *.js.html
 index.html
 .mailmap
+Gemfile.lock
\ No newline at end of file
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 052240d19..5b379ac5c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -137,7 +137,7 @@ Once it gets merged, the changes will immediately appear on the website.
 If you need to make edits in a local repository to see how it looks in the process, do the following:
 
  1. [Install Ruby](http://www.ruby-lang.org/en/) if don't have it yet.
- 2. Run `gem install jekyll`.
+ 2. Run `gem install jekyll` && 'gem install kramdown'.  Alternatively, use bundler by using 'bundle install'
  3. Run `jekyll serve --watch` in the root `Leaflet` folder.
  4. Open `localhost:4000` in your browser.