Updated workflow module.

doc/source/workflow_module.rst

@@ -2,11 +2,14 @@ Workflow Module
 =================
 
 The structure of workflow modules are defined in yaml files and are loaded
-in through the :py:class:`~chipathlon.workflow_module.WorkflowModule`
+in through the :py:class:`~chipathlon.workflow_module.WorkflowModule` class.
 The module yaml files can be found in chipathlon/jobs/modules/
 
-Here is the align.yaml module in full.  This module servers as a good example
-for talking through the features workflow modules have.
+Workflow modules are a way of breaking apart workflows into logical subunits.
+Modules define the order that jobs should be run in, and can account for
+multiple paths in a workflow.  Below is the align.yaml module in full.  This
+module serves as a good example for talking through the features
+workflow modules have.
 
 .. code-block:: yaml