diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index f7268546f..8c953e85c 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2013-01-20  Christopher Faylor  <me.cygwin2013@cgf.cx>
+
+	* malloc_wrapper.cc (malloc_init): Re-add inadvertently dropped comment
+	which explains what's going on with the use_internal calculation.
+
 2013-01-20  Christopher Faylor  <me.cygwin2013@cgf.cx>
 
 	Throughout, update copyrights to reflect dates which correspond to
diff --git a/winsup/cygwin/malloc_wrapper.cc b/winsup/cygwin/malloc_wrapper.cc
index bbf629829..46493b775 100644
--- a/winsup/cygwin/malloc_wrapper.cc
+++ b/winsup/cygwin/malloc_wrapper.cc
@@ -284,6 +284,9 @@ malloc_init ()
   if (!internal_malloc_determined)
     {
       extern void *_sigfe_malloc;
+      /* Decide if we are using our own version of malloc by testing the import
+	 address from user_data.  This will likely need to be updated
+	 for 64-bit.  */
       use_internal = import_address (user_data->malloc) == &_sigfe_malloc;
       malloc_printf ("using %s malloc", use_internal ? "internal" : "external");
       internal_malloc_determined = true;