diff --git a/obmc/mapper/server.py b/obmc/mapper/server.py
index 08700c1..8befd0e 100644
--- a/obmc/mapper/server.py
+++ b/obmc/mapper/server.py
@@ -173,7 +173,16 @@
 
 
 class Association(dbus.service.Object):
+    """Implementation of org.openbmc.Association."""
+
     def __init__(self, bus, path, endpoints):
+        """Construct an Association.
+
+        Arguments:
+        bus -- The python-dbus connection to host the interface
+        path -- The D-Bus object path on which to implement the interface
+        endpoints -- A list of the initial association endpoints
+        """
         super(Association, self).__init__(conn=bus, object_path=path)
         self.endpoints = endpoints