Index: src/launch.py
===================================================================
--- src/launch.py	(revision 56:25d7a0961bf3)
+++ src/launch.py	(revision 57:c19ae9c66693)
@@ -1,2 +1,13 @@
+"""
+The launch module handles launching of simulations as sub-processes, and
+obtaining information about the platform(s) on which the simulations are run.
+
+Classes
+-------
+
+PlatformInformation   - a container for platform information
+SerialLaunchMode      - handles launching local, serial simulations
+DistributedLaunchMode - handles launching distributed simulations using MPI
+"""
 
 import platform
@@ -35,4 +46,5 @@
         pass
 
+
 class SerialLaunchMode(LaunchMode):
     
@@ -67,5 +79,6 @@
                                     system_name=platform.system(),
                                     version=platform.version())]
-    
+
+
 class DistributedLaunchMode(LaunchMode):