Slightly clarify contribution workflow
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b0abc08..7fec2b7 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -88,13 +88,18 @@
Contributing code
-----------------
-The Sky engine repository gladly accepts contributions via GitHub pull requests:
+The Sky engine repository gladly accepts contributions via GitHub pull requests.
+
+To start working on a patch:
* `git fetch upstream`
* `git checkout upstream/master -b name_of_your_branch`
* Hack away
* `git commit -a`
* `git push origin name_of_your_branch`
+
+To send us a pull request:
+
* `git pull-request` (if you are using [Hub](http://github.com/github/hub/)) or go to `https://github.com/<your_name_here>/sky_engine` and click the
"Compare & pull request" button