diff --git a/wa/framework/execution.py b/wa/framework/execution.py
index 72af62b0..e278c80c 100644
--- a/wa/framework/execution.py
+++ b/wa/framework/execution.py
@@ -353,7 +353,11 @@ class Executor(object):
 
 class Runner(object):
     """
+    Triggers running jobs and processing results
 
+    Takes pre-initialized ExcecutionContext and ProcessorManager. Handles
+    actually running the jobs, and triggers the ProcessorManager to handle
+    processing job and run results.
     """
 
     def __init__(self, context, pm):