diff --git a/NEWS b/NEWS
index 2d844efa..b11fbfe4 100644
--- a/NEWS
+++ b/NEWS
@@ -10,7 +10,10 @@ have kqueue() system call due to invalid timeout parameter.
 Changes
 -------
 
- * Fixed the bug that microsecond part of timeval overwlows in waitData()
+ * Fixed the bug that microsecond part of timeval overwlows in
+   waitData(). This bug affects platforms which have kqueue() system
+   call. Those systems are FreeBSD, OpenBSD, NetBSD and Darwin (Mac OS
+   X).