Address comments

CONTRIBUTING.md

@@ -45,6 +45,14 @@ Example: `http://localhost:9876/base/test/web-platform-tests/web-animations/anim
 
 ## Publishing a release
 
+1.  Clone a fresh copy of [web-animations-js](https://github.com/web-animations/web-animations-js).
+
+1.  Make sure you are on the `dev` branch.
+
+    ```sh
+    git checkout dev
+    ```
+
 1.  Determine the version number for the release
 
     * Increment the first number and reset others to 0 when there are large breaking changes
@@ -70,8 +78,14 @@ Example: `http://localhost:9876/base/test/web-platform-tests/web-animations/anim
 
 1.  Build the polyfill with `npm install && grunt` then update `docs/experimental.md`'s Build Target Comparison with the current gzipped sizes.
 
-1.  Commit the above changes to web-animations-js/dev and merge to
-    web-animations-js/master.
+1.  Commit and push the above changes to web-animations-js/dev.
+
+    ```sh
+    # Create a commit with above changes
+    git push origin dev
+    ```
+
+1.  Merge to local master branch:
 
     ```sh
     git checkout master