Fix for issue #1898

Just a few words that specify that building the site takes time (related to issue #1898)

Author: lucienbill

Diff for: README.md

@@ -54,7 +54,7 @@ Edit `/_posts/2014-3-3-Hello-World.md` to publish your first blog post. This [Ma
 2. Clone down your fork `git clone https://github.com/yourusername/yourusername.github.io.git`
 3. Serve the site and watch for markup/sass changes `jekyll serve`
 4. View your website at http://127.0.0.1:4000/
-5. Commit any changes and push everything to the master branch of your GitHub user repository. GitHub Pages will then rebuild and serve your website.
+5. Commit any changes and push everything to the master branch of your GitHub user repository. GitHub Pages will then rebuild and serve your website (note: the rebuild might take a few minutes).
 
 ## Moar!