augment comment

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4939

diff --git a/include/pub_tool_tooliface.h b/include/pub_tool_tooliface.h
index d9d49727daf3d1e97448d993aa2d2cc0e6e195b2..9796a3d085386db3f150923b3f3a4a26d8d3a08b 100644 (file)
--- a/include/pub_tool_tooliface.h
+++ b/include/pub_tool_tooliface.h
@@ -262,7 +262,9 @@ extern void VG_(needs_data_syms) ( void );
 /* Does the tool need shadow memory allocated? */
 extern void VG_(needs_shadow_memory)( void );
 
-/* Does the tool replace malloc() and friends with its own versions? */
+/* Does the tool replace malloc() and friends with its own versions?
+   This has to be combined with the use of a vgpreload_<tool>.so module
+   or it won't work.  See massif/Makefile.am for how to build it. */
 // The 'p' prefix avoids GCC complaints about overshadowing global names.
 extern void VG_(needs_malloc_replacement)(
    void* (*pmalloc)               ( ThreadId tid, SizeT n ),