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-rw-r--r--guides/source/4_2_release_notes.md5
1 files changed, 5 insertions, 0 deletions
diff --git a/guides/source/4_2_release_notes.md b/guides/source/4_2_release_notes.md
index d4acbcdc0b..7b5cd5c799 100644
--- a/guides/source/4_2_release_notes.md
+++ b/guides/source/4_2_release_notes.md
@@ -319,6 +319,11 @@ for detailed changes.
as well as `Kernel#concern` to avoid the `module Foo; extend ActiveSupport::Concern; end`
boilerplate. ([Commit](https://github.com/rails/rails/commit/b16c36e688970df2f96f793a759365b248b582ad))
+* Added `Hash#transform_values` and `Hash#transform_values!` to simplify a
+ common pattern where the values of a hash must change, but the keys are left
+ the same.
+ ([Pull Request](https://github.com/rails/rails/pull/15819))
+
Credits
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