diff --git a/winsup/cygwin/child_info.h b/winsup/cygwin/child_info.h
index 39059bb4d..5c449e167 100644
--- a/winsup/cygwin/child_info.h
+++ b/winsup/cygwin/child_info.h
@@ -53,7 +53,7 @@ struct cchildren
 class child_info
 {
 public:
-  DWORD msv_count;	// set to pseudo-count on Vista, zeroed otherwise
+  DWORD msv_count;	// set to pseudo-count on Vista WOW64, zeroed otherwise
   DWORD cb;		// size of this record
   DWORD intro;		// improbable string
   DWORD magic;		// magic number unique to child_info