diff --git a/reference/ds/ds.collection.xml b/reference/ds/ds.collection.xml
index 13b114c008..c0a82b0bee 100644
--- a/reference/ds/ds.collection.xml
+++ b/reference/ds/ds.collection.xml
@@ -31,8 +31,8 @@
 
     <ooclass><classname>Ds\Collection</classname></ooclass>
 
-    <oointerface><interfacename>Traversable</interfacename></oointerface>
     <oointerface><interfacename>Countable</interfacename></oointerface>
+    <oointerface><interfacename>IteratorAggregate</interfacename></oointerface>
     <oointerface><interfacename>JsonSerializable</interfacename></oointerface>
 
     </classsynopsisinfo>
@@ -45,6 +45,29 @@
 
   </section>
 
+  <section role="changelog">
+   &reftitle.changelog;
+   <informaltable>
+    <tgroup cols="2">
+     <thead>
+      <row>
+       <entry>&Version;</entry>
+       <entry>&Description;</entry>
+      </row>
+     </thead>
+     <tbody>
+      <row>
+       <entry>PECL ds 1.4.0</entry>
+       <entry>
+        <classname>Collection</classname> implements
+        <interfacename>IteratorAggregate</interfacename> now instead of just <interfacename>Traversable</interfacename>. (This change came to the polyfill in 1.4.1.)
+       </entry>
+      </row>
+     </tbody>
+    </tgroup>
+   </informaltable>
+  </section>
+
  </partintro>
 
  &reference.ds.ds.entities.collection;