Fixed ref to module docs.
@@ -165,7 +165,7 @@ reliability. However, the "single point of failure" this may represent is acknow
System of processes
===================
-The library class :class:`~eventsourcing.application.system.System`
+The library class :class:`~eventsourcing.system.definition.System`
can be used to define a system of process applications,
entirely independently of infrastructure.
In a system, one process application can follow another. One process can
