updated the changes guide

src/reference/changes.rst

@@ -38,13 +38,58 @@ Cylc 8.4
 Cylc Remove
 ^^^^^^^^^^^
 
+Cylc Remove now allows removing tasks which are not longer active, making
+it look like they never ran. Removing a running task will now kill that task.
+
+The ``cylc remove`` command now has the ``--flow`` option, allowing removal
+of a task from specific flows.
+
+Tasks Removed from all flows are retained in the workflow database with
+``flow=none`` for provenance.
+
+.. image:: ../user-guide/interventions/remove.gif
+   :width: 60%
+
+.. seealso::
+
+   See :ref:`interventions.remove_tasks` to see an example of this feature in
+   action.
 
 Skip Mode
 ^^^^^^^^^
 
+Tasks can be configured to run in skip mode, either from the configuration
+or by broadcasting.
+
+.. image:: ../user-guide/interventions/skip-cycle.gui.gif
+   :width: 60%
+
+``cylc set --out skip`` will set outputs for a task as if the task has run
+in skip mode. The task outputs delivered by skip mode can be customized using
+:cylc:conf:`[runtime][<namespace>][skip]outputs` or defaults to behaviour
+described in :ref:`skip_mode.task_outputs`.
+
+This can be used to skip a cycle or a task (for a full example see
+ :ref:`interventions.skip_cycle`).
+
+It may also be useful for :ref:`EfficientInterFamilyTriggering` and
+for :ref:`skip_mode.parameter_exclusion`.
+
+.. seealso::
+
+   :ref:`task-run-modes.skip`
+
 Trigger When Paused
 ^^^^^^^^^^^^^^^^^^^
 
+Tasks can now be triggered and will run immediately while the workflow
+is paused.
+
+
+.. image:: ../user-guide/interventions/trigger-while-paused.gif
+   :width: 60%
+
+See :ref:`interventions.trigger_while_paused` for an example of this feature.
 
 
 EmPy Support Removed

src/user-guide/interventions/index.rst

@@ -441,6 +441,8 @@ but specify the "failed" output rather than
 "succeeded".
 
 
+.. _interventions.trigger_while_paused:
+
 Pause The Workflow And Trigger Tasks One By One
 -----------------------------------------------
 
@@ -489,6 +491,7 @@ Pause The Workflow And Trigger Tasks One By One
       submit) until released. If you hold a running task its job will not be
       affected, but it will not submit any :term:`retries <retry>` until released.
 
+.. _interventions.skip_cycle:
 
 I want to Skip a cycle of tasks and allow the workflow to continue
 ------------------------------------------------------------------
@@ -525,6 +528,8 @@ I want to Skip a cycle of tasks and allow the workflow to continue
    multiple named tasks.
 
 
+.. _interventions.remove_tasks:
+
 Remove Tasks
 ------------
 

src/user-guide/task-implementation/skip-mode.rst

@@ -29,6 +29,8 @@ Skip mode is designed as an aid to workflow control:
    If you are using skip mode deliberately then this can be
    ignored.
 
+.. _skip_mode.task_outputs:
+
 Task Outputs
 ------------
 
@@ -97,6 +99,8 @@ families improves the efficiency of the Cylc scheduler.
    This scenario is explained in detail in
    :ref:`EfficientInterFamilyTriggering`
 
+.. _skip_mode.parameter_exclusion:
+
 Parameter Exclusion
 ^^^^^^^^^^^^^^^^^^^