--- a/taskcluster/docs/how-tos.rst
+++ b/taskcluster/docs/how-tos.rst
@@ -37,17 +37,17 @@ 1. Find a recent decision task on the pr
    contents are simple enough if you would like to modify it, and it is
    documented in :doc:`parameters`.
 
 2. Run one of the ``mach taskgraph`` subcommands (see :doc:`taskgraph`) to
    generate a baseline against which to measure your changes.  For example:
 
    .. code-block:: none
 
-       ./mach taskgraph --json -p parameters.yml tasks > old-tasks.json
+       ./mach taskgraph tasks --json -p parameters.yml > old-tasks.json
 
 3. Make your modifications under ``taskcluster/``.
 
 4. Run the same ``mach taskgraph`` command, sending the output to a new file,
    and use ``diff`` to compare the old and new files.  Make sure your changes
    have the desired effect and no undesirable side-effects.
 
 5. When you are satisfied with the changes, push them to try to ensure that the