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+==========
+Parameters
+==========
+
+Task-graph generation takes a collection of parameters as input, in the form of
+a JSON or YAML file.
+
+During decision-task processing, some of these parameters are supplied on the
+command line or by environment variables.  The decision task helpfully produces
+a full parameters file as one of its output artifacts.  The other ``mach
+taskgraph`` commands can take this file as input.  This can be very helpful
+when working on a change to the task graph.
+
+When experimenting with local runs of the task-graph generation, it is always
+best to find a recent decision task's ``parameters.yml`` file, and modify that
+file if necessary, rather than starting from scratch.  This ensures you have a
+complete set of parameters.
+
+The properties of the parameters object are described here, divided rougly by
+topic.
+
+Push Information
+----------------
+
+``triggered_by``
+   The event that precipitated this decision task; one of ``"nightly"`` or
+   ``"push"``.
+
+``base_repository``
+   The repository from which to do an initial clone, utilizing any available
+   caching.
+
+``head_repository``
+   The repository containing the changeset to be built.  This may differ from
+   ``base_repository`` in cases where ``base_repository`` is likely to be cached
+   and only a few additional commits are needed from ``head_repository``.
+
+``head_rev``
+   The revision to check out; this can be a short revision string
+
+``head_ref``
+   For Mercurial repositories, this is the same as ``head_rev``.  For
+   git repositories, which do not allow pulling explicit revisions, this gives
+   the symbolic ref containing ``head_rev`` that should be pulled from
+   ``head_repository``.
+
+``owner``
+   Email address indicating the person who made the push.  Note that this
+   value may be forged and *must not* be relied on for authentication.
+
+``message``
+   The commit message
+
+``pushlog_id``
+   The ID from the ``hg.mozilla.org`` pushlog
+
+``pushdate``
+   The timestamp of the push to the repository that triggered this decision
+   task.  Expressed as an integer seconds since the UNIX epoch.
+
+``build_date``
+   The timestamp of the build date. Defaults to ``pushdate`` and falls back to present time of
+   taskgraph invocation. Expressed as an integer seconds since the UNIX epoch.
+
+``moz_build_date``
+   A formatted timestamp of ``build_date``. Expressed as a string with the following
+   format: %Y%m%d%H%M%S
+
+Tree Information
+----------------
+
+``project``
+   Another name for what may otherwise be called tree or branch or
+   repository.  This is the unqualified name, such as ``mozilla-central`` or
+   ``cedar``.
+
+``level``
+   The `SCM level
+   <https://www.mozilla.org/en-US/about/governance/policies/commit/access-policy/>`_
+   associated with this tree.  This dictates the names of resources used in the
+   generated tasks, and those tasks will fail if it is incorrect.
+
+Target Set
+----------
+
+The "target set" is the set of task labels which must be included in a task
+graph.  The task graph generation process will include any tasks required by
+those in the target set, recursively.  In a decision task, this set can be
+specified programmatically using one of a variety of methods (e.g., parsing try
+syntax or reading a project-specific configuration file).
+
+``target_tasks_method``
+    The method to use to determine the target task set.  This is the suffix of
+    one of the functions in ``tascluster/taskgraph/target_tasks.py``.
+
+``optimize_target_tasks``
+   If true, then target tasks are eligible for optimization.