diff --git a/src/main/histFileMod.F90 b/src/main/histFileMod.F90
index b2df9abfab..14793441ae 100644
--- a/src/main/histFileMod.F90
+++ b/src/main/histFileMod.F90
@@ -91,6 +91,7 @@ module histFileMod
 
   character(len=max_namlen+2), public :: &
        hist_fincl1(max_flds) = ' '       ! namelist: list of fields to include in history tape 1
+                                         !            aka 'h0' history file.
   character(len=max_namlen+2), public :: &
        hist_fincl2(max_flds) = ' '       ! namelist: list of fields to include in history tape 2
   character(len=max_namlen+2), public :: &
@@ -116,6 +117,7 @@ module histFileMod
 
   character(len=max_namlen+2), public :: &
        hist_fexcl1(max_flds) = ' ' ! namelist: list of fields to exclude from history tape 1
+                                   !           aka 'h0' history file.
   character(len=max_namlen+2), public :: &
        hist_fexcl2(max_flds) = ' ' ! namelist: list of fields to exclude from history tape 2
   character(len=max_namlen+2), public :: &