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+Empty Selector
+==============
+
+The ``mach try empty`` subcommand is very simple, it won't schedule any additional tasks. You'll
+still see lint tasks and python-unittest tasks if applicable, this is due to a configuration option
+in taskcluster.
+
+Other than those, your try run will be empty. You can use treeherder's ``Add new jobs`` feature to
+selectively add additional tasks after the fact.
+
+.. note::
+
+    To use ``Add new jobs`` you'll need to be logged in and have commit access level 1, just as if
+    you were pushing to try.
+
+To do this:
+
+    1. Click the drop-down arrow at the top right of your commit.
+    2. Select ``Add new jobs`` (it may take a couple seconds to load).
+    3. Choose your desired tasks by clicking them one at a time.
+    4. At the top of your commit, select ``Trigger New Jobs``.