diff --git a/sorc/chgres_cube.fd/chgres.F90 b/sorc/chgres_cube.fd/chgres.F90
index 3aace4ba8..c3472867d 100644
--- a/sorc/chgres_cube.fd/chgres.F90
+++ b/sorc/chgres_cube.fd/chgres.F90
@@ -1,12 +1,19 @@
 !> @file
 !! @brief Initialize an FV3 model run.
 !!
-!! Program CHGRES_CUBE
+!! Initialize an FV3 run using history or restart data from another
+!! FV3 run, the spectral GFS, and a few other models. Converts
+!! atmospheric, surface and nst data.
 !!
-!! Initialize an FV3 run using history or restart data from
-!! another FV3 run, the spectral GFS, and a few other models.
-!! Converts atmospheric, surface and nst data.
+!! This file reads a configuration namelist.
 !!
+!! Usage:
+!! Link the configuration namelist to ./fort.41.  Then run the
+!! program with a multiple of six mpi tasks (an ESMF library
+!! requirement for fv3 cubed sphere grids).
+!!
+!!
+!! @author George Gayno NOAA/EMC
  program chgres
 
  use mpi