diff --git a/NEWS b/NEWS
index 7ae255f..68089fc 100644
--- a/NEWS
+++ b/NEWS
@@ -86,9 +86,7 @@ with all sufficient information, see the ChangeLog file.

 * Math
   * incompatible changes:
-    * Math.log now raises Math::DomainError instead of returning NaN if the
-      base is less than 0, and returns NaN instead of -infinity if both of
-      two arguments are 0.
+    * Math.log now raises Math::DomainError unless the base is positive number except 1.
     * Math.atan2 now returns values like as expected by C99 if both two
       arguments are infinity.