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diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 457eb84a62..938d4f9d31 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,35 @@
+*   Fix modulo operations involving durations
+
+    Rails 5.1 introduce an `ActiveSupport::Duration::Scalar` class as a wrapper
+    around a numeric value as a way of ensuring a duration was the outcome of
+    an expression. However the implementation was missing support for modulo
+    operations. This support has now been added and should result in a duration
+    being returned from expressions involving modulo operations.
+
+    Prior to Rails 5.1:
+
+        5.minutes % 2.minutes
+        => 60
+
+    Now:
+
+        5.minutes % 2.minutes
+        => 1 minute
+
+    Fixes #29603 and #29743.
+
+    *Sayan Chakraborty*, *Andrew White*
+
+*   Fix division where a duration is the denominator
+
+    PR #29163 introduced a change in behavior when a duration was the denominator
+    in a calculation - this was incorrect as dividing by a duration should always
+    return a `Numeric`. The behavior of previous versions of Rails has been restored.
+
+    Fixes #29592.
+
+    *Andrew White*
+
 *   Add purpose and expiry support to `ActiveSupport::MessageVerifier` &
    `ActiveSupport::MessageEncryptor`.