diff --git a/base/internals/psi_ldsc_pre_halo.f90 b/base/internals/psi_ldsc_pre_halo.f90
index f6b83129..d241ae3c 100644
--- a/base/internals/psi_ldsc_pre_halo.f90
+++ b/base/internals/psi_ldsc_pre_halo.f90
@@ -32,14 +32,8 @@
 ! File: psi_ldsc_pre_halo.f90
 !
 ! Subroutine: psi_ldsc_pre_halo
-!   Build initial versions of data exchange lists.
-!   When the descriptor is for a large index space, we cannot build 
-!   the data exchange lists "on-the-fly", but we also want to keep using the 
-!   same format conversion routines we use in the small index space case, 
-!   hence this adapter routine.
-!   Since it also convers the AVL tree data structure into the hashed list 
-!   of ordered lists, it may be called to do just that; perhaps we should 
-!   cut away that functionality and put it somewhere else...
+!   Build initial versions of data exchange lists for the 
+!   large index space case.
 !   
 ! 
 ! Arguments: