diff --git a/THANKS b/THANKS
index f4cc95176..3946e5842 100644
--- a/THANKS
+++ b/THANKS
@@ -26,6 +26,7 @@ For fixes or providing information which led to a fix:
 	Clinton Ebadi
            Eric Gillespie, Jr
            John Goerzen
+	   Sven Hartrumpf
 	   Eric Hanchrow
          Aubrey Jaffer
         Richard Kim
diff --git a/libguile/ChangeLog b/libguile/ChangeLog
index 62a02e24e..8e1b914e3 100644
--- a/libguile/ChangeLog
+++ b/libguile/ChangeLog
@@ -1,3 +1,9 @@
+2002-12-10  Han-Wen Nienhuys  <hanwen@cs.uu.nl>
+
+	* modules.c (scm_export): new function
+
+	* gc-card.c: add a note about malloc()/free() overhead.
+
 2002-12-10  Mikael Djurfeldt  <mdj@kvast.blakulla.net>
 
 	* Makefile.am (c-tokenize.$(OBJEXT)): Don't look for c-tokenize.c
diff --git a/libguile/gc-card.c b/libguile/gc-card.c
index 13cca2606..3926fb77f 100644
--- a/libguile/gc-card.c
+++ b/libguile/gc-card.c
@@ -81,9 +81,28 @@ SCM scm_i_structs_to_free;
   It would be cleaner to have a separate function sweep_value(), but
   that is too slow (functions with switch statements can't be
   inlined).
-  
- */
 
+
+
+  
+  NOTE:
+
+  This function is quite efficient. However, for many types of cells,
+  allocation and a de-allocation involves calling malloc() and
+  free().
+
+  This is costly for small objects (due to malloc/free overhead.)
+  (should measure this).
+
+  It might also be bad for threads: if several threads are allocating
+  strings concurrently, then mallocs for both threads may have to
+  fiddle with locks.
+
+  It might be interesting to add a separate memory pool for small
+  objects to each freelist.
+
+  --hwn.
+ */
 int
 scm_i_sweep_card (scm_t_cell *  p, SCM *free_list, scm_t_heap_segment*seg)
 #define FUNC_NAME "sweep_card"
diff --git a/libguile/modules.c b/libguile/modules.c
index 28b65caa2..52d054c94 100644
--- a/libguile/modules.c
+++ b/libguile/modules.c
@@ -115,6 +115,10 @@ scm_c_call_with_current_module (SCM module,
   return scm_c_with_fluid (the_module, module, func, data);
 }
 
+
+/*
+  convert "A B C" to scheme list (A B C)
+ */
 static SCM
 convert_module_name (const char *name)
 {
@@ -177,6 +181,16 @@ scm_c_use_module (const char *name)
 static SCM module_export_x_var;
 
 
+/*
+  TODO: should export this function? --hwn.
+ */
+static SCM
+scm_export (SCM module, SCM namelist)
+{
+  scm_call_2 (SCM_VARIABLE_REF (module_export_x_var),
+	      module, namelist);
+}
+
 
 /*
   @code{scm_c_export}(@var{name-list})
@@ -189,7 +203,6 @@ static SCM module_export_x_var;
     scm_c_export ("add-double-record", "bamboozle-money", NULL);
   @end example
 */
-
 void
 scm_c_export (const char *name, ...)
 {
@@ -208,11 +221,11 @@ scm_c_export (const char *name, ...)
 	  tail = SCM_CDRLOC (*tail);
 	}
       va_end (ap);
-      scm_call_2 (SCM_VARIABLE_REF (module_export_x_var),
-		  scm_current_module (), names);
+      scm_export (scm_current_module(), names);
     }
 }
 
+
 /* Environments */
 
 SCM