1 files changed, 3 insertions, 0 deletions
diff --git a/NEWS b/NEWS
index cd3b548625..89ab3f0d61 100644
--- a/NEWS
+++ b/NEWS
@@ -181,6 +181,9 @@ with all sufficient information, see the ChangeLog file.
 * lib/matrix.rb
  * Add Vector#round. https://github.com/ruby/ruby/pull/802
 
+* lib/cmath.rb
+ * methods which has suffix '!' are now deprecated.
+
 * ext/coverage/coverage.c
   * Coverage.peek_result: new method to allow coverage to be captured without
     stopping the coverage tool.