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+Again Selector
+==============
+
+When you push to try, the computed ``try_task_config.json`` is saved in a
+history file under ``~/.mozbuild/srcdirs/<srcdir hash>/history`` (note: the
+``syntax`` selector does not use ``try_task_config.json`` yet so does not save
+any history). You can then use the ``again`` selector to re-push any of your
+previously generated task configs.
+
+In the simple case, you can re-run your last try push with:
+
+.. code-block:: shell
+
+    $ mach try again
+
+If you want to re-push a task config a little further down the history stack,
+first you need to figure out its index with:
+
+.. code-block:: shell
+
+    $ mach try again --list
+
+Then run:
+
+.. code-block:: shell
+
+    $ mach try again --index <index>
+
+Note that index ``0`` is always the most recent ``try_task_config.json`` in the
+history. You can clear your history with:
+
+.. code-block:: shell
+
+    $ mach try again --purge
+
+Only the 10 most recent pushes will be saved in your history.