diff --git a/mlprec/mld_cprecset.f90 b/mlprec/mld_cprecset.f90
index ee2739a7..1eed8ebd 100644
--- a/mlprec/mld_cprecset.f90
+++ b/mlprec/mld_cprecset.f90
@@ -69,6 +69,14 @@
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
 !   
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
+!   
 subroutine mld_cprecseti(p,what,val,info,ilev)
 
   use psb_base_mod
@@ -316,6 +324,14 @@ end subroutine mld_cprecseti
 !               preconditioner parameter has to be set. 
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
+!   
 !   
 subroutine mld_cprecsetc(p,what,string,info,ilev)
 
@@ -399,6 +415,14 @@ end subroutine mld_cprecsetc
 !               preconditioner parameter has to be set. 
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
+!   
 !   
 subroutine mld_cprecsetr(p,what,val,info,ilev)
 
diff --git a/mlprec/mld_dprecset.f90 b/mlprec/mld_dprecset.f90
index abf7a7aa..482c4afd 100644
--- a/mlprec/mld_dprecset.f90
+++ b/mlprec/mld_dprecset.f90
@@ -68,6 +68,13 @@
 !               preconditioner parameter has to be set. 
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
 !   
 subroutine mld_dprecseti(p,what,val,info,ilev)
 
@@ -316,6 +323,13 @@ end subroutine mld_dprecseti
 !               preconditioner parameter has to be set. 
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
 !   
 subroutine mld_dprecsetc(p,what,string,info,ilev)
 
@@ -398,6 +412,13 @@ end subroutine mld_dprecsetc
 !               preconditioner parameter has to be set. 
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
 !   
 subroutine mld_dprecsetr(p,what,val,info,ilev)
 
diff --git a/mlprec/mld_sprecset.f90 b/mlprec/mld_sprecset.f90
index 09b4c510..04829e62 100644
--- a/mlprec/mld_sprecset.f90
+++ b/mlprec/mld_sprecset.f90
@@ -69,6 +69,14 @@
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
 !   
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
+!   
 subroutine mld_sprecseti(p,what,val,info,ilev)
 
   use psb_base_mod
@@ -316,6 +324,14 @@ end subroutine mld_sprecseti
 !               preconditioner parameter has to be set. 
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
+!   
 !   
 subroutine mld_sprecsetc(p,what,string,info,ilev)
 
@@ -398,6 +414,14 @@ end subroutine mld_sprecsetc
 !               preconditioner parameter has to be set. 
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
+!   
 !   
 subroutine mld_sprecsetr(p,what,val,info,ilev)
 
diff --git a/mlprec/mld_zprecset.f90 b/mlprec/mld_zprecset.f90
index 73614bad..3b8f7fff 100644
--- a/mlprec/mld_zprecset.f90
+++ b/mlprec/mld_zprecset.f90
@@ -68,6 +68,14 @@
 !               preconditioner parameter has to be set. 
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
+!   
 !   
 subroutine mld_zprecseti(p,what,val,info,ilev)
 
@@ -316,6 +324,14 @@ end subroutine mld_zprecseti
 !               preconditioner parameter has to be set. 
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
+!   
 !   
 subroutine mld_zprecsetc(p,what,string,info,ilev)
 
@@ -399,6 +415,14 @@ end subroutine mld_zprecsetc
 !               preconditioner parameter has to be set. 
 !               If nlev is not present, the parameter identified by 'what'
 !               is set at all the appropriate levels.
+!
+!  NOTE: currently, the use of the argument ilev is not "safe" and is reserved to
+!  MLD2P4 developers. Indeed, by using ilev it is possible to set different values
+!  of the same parameter at different levels 1,...,nlev-1, even in cases where
+!  the parameter must have the same value at all the levels but the coarsest one.
+!  For this reason, the interface mld_precset to this routine has been built in
+!  such a way that ilev is not visible to the user (see mld_prec_mod.f90).
+!   
 !   
 subroutine mld_zprecsetr(p,what,val,info,ilev)