[glibmm] Update a TODO

[Murray Cumming <murrayc src gnome org>]

commit 072c48b1b517513dab52b91eb22297cac9d1b8e9
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Apr 4 11:18:11 2011 +0200

    Update a TODO

 glib/glibmm/refptr.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/glib/glibmm/refptr.h b/glib/glibmm/refptr.h
index e57cf1c..bd27b16 100644
--- a/glib/glibmm/refptr.h
+++ b/glib/glibmm/refptr.h
@@ -155,8 +155,9 @@ public:
   template <class T_CastFrom>
   static inline RefPtr<T_CppObject> cast_const(const RefPtr<T_CastFrom>& src);
 
-  //TODO: Remove these if we replace operator bool() with operator void* after 
+  //TODO: Maybe remove these if we replace operator bool() with operator const void* after 
   //an API/ABI break, as suggested by Daniel Elstner? murrayc.
+  //See bug https://bugzilla.gnome.org/show_bug.cgi?id=626858
 
   /** Compare based on the underlying instance address.
    *