Define target branches, give examples

what-is-a-merge-request/README.md

@@ -9,3 +9,13 @@ external collaborators
 Offsite folks can join us via [BlueJeans](https://bluejeans.com/309751285).
 
 
+## What is my target branch now?
+Gitlab uses the term 'target branch' to mean "The branch **into which** new 
+changes will be merged". So, if you are using the gitlab interface to edit a
+file, you will be able to commit those changes into a new target branch. Later,
+if you would like to merge those changes into `master`, then `master` will be
+your target branch, and the earlier one will be your source branch.
+
+1. Change README.md in master, commit to 'spell-my-name-correctly' target branch
+2. Open a merge request with 'spell-my-name-correctly' as the *source* branch, and 'master' as the *target* branch.
+3. Merge away!
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