diff --git a/bin/captureDevice b/bin/captureDevice
--- a/bin/captureDevice
+++ b/bin/captureDevice
@@ -1,5 +1,7 @@
 #!bin/python
-
+"""
+Operate a motorized light and take pictures of it in every position.
+"""
 from rdflib import URIRef
 from twisted.internet import reactor
 from twisted.internet.defer import inlineCallbacks, Deferred