Final tweak to DESCRIPTION

Author: Robinlovelace

DESCRIPTION

@@ -8,13 +8,12 @@ Authors@R: c(
            comment = c(ORCID = "0000-0002-1057-3721"))
   )
 Description: Develop spatial interaction models (SIMs).  SIMs predict the
-    amount of interactions, for example number of trips per day, between
-    geographic entities representing trip origins and destinations.  SIMs
-    can be unconstrained, production-constrained, attraction-constrained
-    and doubly-constrained (Wilson 1979) <doi:10.1068/a030001>.  The
-    package contains functions for creating origin-destination datasets
+    amount of interaction, for example number of trips per day, between
+    geographic entities representing trip origins and destinations.
+    Contains functions for creating origin-destination datasets
     from geographic input datasets and calculating movement between
-    origin-destination pairs.
+    origin-destination pairs with constrained, production-constrained,
+    and attraction-constrained models (Wilson 1979) <doi:10.1068/a030001>.
 License: AGPL (>= 3)
 URL: https://github.com/robinlovelace/simodels,
     https://robinlovelace.github.io/simodels/