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diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index bc8d11a297..8b671a8c27 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,18 @@
+*   Added method `#eql?` to `ActiveSupport::Duration`, in addition to `#==`.
+
+    Currently, the following returns `false`, contrary to expectation:
+
+        1.minute.eql?(1.minute)
+
+    Adding method `#eql?` will make this behave like expected. Method `#eql?` is
+    just a bit stricter than `#==`, as it checks whether the argument is also a duration. Their
+    parts may be different though.
+
+        1.minute.eql?(60.seconds)  # => true
+        1.minute.eql?(60)          # => false
+
+    *Joost Lubach*
+
 *   Time#change can now change nanoseconds (:nsec) as a higher-precision
     alternative to microseconds (:usec).