diff --git a/GEOSldas_App/preprocess_ldas_routines.F90 b/GEOSldas_App/preprocess_ldas_routines.F90
index fd8ed74..36c3494 100644
--- a/GEOSldas_App/preprocess_ldas_routines.F90
+++ b/GEOSldas_App/preprocess_ldas_routines.F90
@@ -2260,7 +2260,7 @@ subroutine optimize_latlon(fname_tilefile, N_proc_string, optimized_file, run_di
        enddo
        
        if( k /=6 ) then
-          err_msg = 'one or more processes may across the face'
+          err_msg = 'one or more processes may have tiles from two or more faces'
           call ldas_abort(LDAS_GENERIC_ERROR, Iam, err_msg)      
        end if