-The Tracker class uses the MTPGraph. From the definition of the
-spatial topology, it builds a graph with one source, one sink, and two
-nodes per location and time. This structure ensures the trajectories
-computed by the tracker to be node-disjoint by forcing the paths
-computed by the MTPGraph to be edge-disjoint.
+The MTPTracker is a wrapper around the MTPGraph class.
+
+From the defined the spatial topology and number of time steps, it
+builds a graph with one source, one sink, and two nodes per location
+and time. This structure ensures that the trajectories computed by the
+MTPTracker will be node-disjoint, since the trajectories computed by
+the MTPGraph are edge-disjoint.