DARWIN sync comment.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@9943 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/pub_core_threadstate.h b/coregrind/pub_core_threadstate.h
index bcba985..e7bde55 100644
--- a/coregrind/pub_core_threadstate.h
+++ b/coregrind/pub_core_threadstate.h
@@ -114,7 +114,9 @@
    ThreadArchState;
 
 
-/* OS-specific thread state */
+/* OS-specific thread state.  IMPORTANT: if you add fields to this,
+   you _must_ add code to os_state_clear() to initialise those
+   fields. */
 typedef
    struct {
       /* who we are */