Update desription to point to closed source lixoftConnectors

DESCRIPTION

@@ -19,7 +19,13 @@ Description: 'Monolix' is a tool for running mixed effects model using
     number of observations, the number of subjects, and the covariance
     matrix) with a 'rxode2' model.  This is complementary to the
     'babelmixr2' package that translates 'nlmixr2' models to 'NONMEM' and can
-    convert the objects converted from 'monolix2rx' to a full 'nlmixr2' fit.
+    convert the objects converted from 'monolix2rx' to a full 'nlmixr2' fit. While not
+    required, you can  get/install the 'lixoftConnectors' package in the 'Monolix'
+    installation, as described at the following url   <https://monolix.lixoft.com/monolix-api/lixoftconnectors_installation/>. When
+  'lixoftConnectors' is available, 'Monolix' can be used to load its model library
+  instead manually setting up text files (which only works with old versions of
+  'Monolix').
+  command line usage.
 License: MIT + file LICENSE
 Encoding: UTF-8
 Roxygen: list(markdown = TRUE)