diff --git a/src/error.F90 b/src/error.F90
index d3cc686..3012cc7 100644
--- a/src/error.F90
+++ b/src/error.F90
@@ -27,30 +27,44 @@
 !
 module error
 
+! module variables are not implicit by default
+!
   implicit none
 
+!- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+!
   contains
 !
 !===============================================================================
 !
-! print_error: subroutine prints error
+! subroutine PRINT_ERROR:
+! ----------------------
+!
+!   Subroutine prints an error message with the module/subroutine where
+!   the error occured.
+!
+!   Arguments:
+!
+!     loc - string informing about the place where the error occured
+!           (for example 'module name::subroutine name:[line]');
+!     msg - string of the actual error message;
 !
 !===============================================================================
 !
-  subroutine print_error(position, text)
+  subroutine print_error(loc, msg)
 
+! local variables are not implicit by default
+!
     implicit none
 
-! input arguments
+! subroutine arguments
 !
-    character(len=*), intent(in) :: position, text
+    character(len=*), intent(in) :: loc, msg
 !
 !-------------------------------------------------------------------------------
 !
     write(*,*)
-    write(*,"('[error in ', a, ']: ', a)") trim(position), trim(text)
-    write(*,*)
-    stop
+    write(*,"('[ERROR in ', a, ']: ', a)") trim(loc), trim(msg)
 
 !-------------------------------------------------------------------------------
 !
@@ -58,23 +72,34 @@ module error
 !
 !===============================================================================
 !
-! print_warning: subroutine prints warning
+! subroutine PRINT_WARNING:
+! ------------------------
+!
+!   Subroutine prints a warning message with the module/subroutine where
+!   the warning occured.
+!
+!   Arguments:
+!
+!     loc - string informing about the place where the warning occured
+!           (for example 'module name::subroutine name:[line]');
+!     msg - string of the actual warning message;
 !
 !===============================================================================
 !
-  subroutine print_warning(position, text)
+  subroutine print_warning(loc, msg)
 
+! local variables are not implicit by default
+!
     implicit none
 
-! input arguments
+! subroutine arguments
 !
-    character(len=*), intent(in) :: position, text
+    character(len=*), intent(in) :: loc, msg
 !
 !-------------------------------------------------------------------------------
 !
     write(*,*)
-    write(*,"('[warning in ', a, ']: ', a)") trim(position), trim(text)
-    write(*,*)
+    write(*,"('[WARNING in ', a, ']: ', a)") trim(loc), trim(msg)
 
 !-------------------------------------------------------------------------------
 !
@@ -82,27 +107,38 @@ module error
 !
 !===============================================================================
 !
-! print_info: subroutine prints information
+! subroutine PRINT_NOTIFICATION:
+! -----------------------------
+!
+!   Subroutine prints a notification message with the module/subroutine where
+!   the notification occured.
+!
+!   Arguments:
+!
+!     loc - string informing about the place where the notification occured
+!           (for example 'module name::subroutine name:[line]');
+!     msg - string of the actual notification message;
 !
 !===============================================================================
 !
-  subroutine print_info(position, text)
+  subroutine print_notification(loc, msg)
 
+! local variables are not implicit by default
+!
     implicit none
 
-! input arguments
+! subroutine arguments
 !
-    character(len=*), intent(in) :: position, text
+    character(len=*), intent(in) :: loc, msg
 !
 !-------------------------------------------------------------------------------
 !
     write(*,*)
-    write(*,"('[info in ', a, ']: ', a)") trim(position), trim(text)
-    write(*,*)
+    write(*,"('[NOTIFICATION in ', a, ']: ', a)") trim(loc), trim(msg)
 
 !-------------------------------------------------------------------------------
 !
-  end subroutine print_info
+  end subroutine print_notification
 
 !===============================================================================
 !
diff --git a/src/io.F90 b/src/io.F90
index ebf83bc..62852a2 100644
--- a/src/io.F90
+++ b/src/io.F90
@@ -1180,7 +1180,7 @@ module io
     use coordinates, only : nn, ng, in, jn, kn, maxlev, toplev, ir, jr, kr
     use coordinates, only : initialize_coordinates, finalize_coordinates
     use coordinates, only : xmin, xmax, ymin, ymax, zmin, zmax
-    use error    , only : print_error, print_warning
+    use error    , only : print_error
     use evolution, only : step, time, dt, dtn
     use hdf5     , only : hid_t, hsize_t
     use hdf5     , only : h5gopen_f, h5gclose_f, h5aget_num_attrs_f            &
diff --git a/src/mesh.F90 b/src/mesh.F90
index abfbecb..8f3e484 100644
--- a/src/mesh.F90
+++ b/src/mesh.F90
@@ -462,7 +462,7 @@ module mesh
     use blocks         , only : get_mblocks, get_nleafs
     use coordinates    , only : minlev, maxlev, res
     use domains        , only : setup_domain
-    use error          , only : print_info, print_error
+    use error          , only : print_error
     use mpitools       , only : master, nproc, nprocs
     use problems       , only : setup_problem
     use refinement     , only : check_refinement_criterion
@@ -787,7 +787,7 @@ module mesh
     use blocks         , only : append_datablock, remove_datablock, link_blocks
     use coordinates    , only : minlev, maxlev, toplev, im, jm, km, res
     use equations      , only : nv
-    use error          , only : print_info, print_error
+    use error          , only : print_error
 #ifdef MPI
     use mpitools       , only : master, nprocs, nproc
     use mpitools       , only : reduce_sum_integer_array