Comment update.

src/engine/InterestManagement/Terrain.java

@@ -120,7 +120,7 @@ public class Terrain {
 
     public static float getWorldHeight(Zone zone, Vector3fImmutable world_loc) {
 
-        // Retrieve the next zone with a terrain defined.
+        // Retrieve the next zone up in the tree with a terrain defined.
 
         Zone terrainZone = getNextZoneWithTerrain(zone);
         Zone parentZone = getNextZoneWithTerrain(zone.parent);