Add motivational blurb to command_stack docstring.

diff --git a/hooke/command_stack.py b/hooke/command_stack.py
index 202e599a7ffafcaf703dd48768016c04401c7cf6..69bee4ba60e47170b9d711bacc137553f5dd2855 100644 (file)
--- a/hooke/command_stack.py
+++ b/hooke/command_stack.py
@@ -18,6 +18,16 @@
 
 """The ``command_stack`` module provides tools for managing and
 executing stacks of :class:`~hooke.engine.CommandMessage`\s.
+
+In experiment analysis, the goal is to construct a
+:class:`~hooke.command_stack.CommandStack` that starts with your raw
+experiment data and ends with your analyzed results.  These
+:class:`~hooke.command_stack.CommandStack`\s are stored in your
+:class:`~hooke.playlist.FilePlaylist`, so they are saved to disk with
+the analysis results.  This means you will always have a record of
+exactly how you processed the raw data to produce your analysis
+results, which makes it easy to audit your approach or go back and
+reanalyze older data.
 """
 
 import os