diff --git a/CHANGELOG.md b/CHANGELOG.md
index 347b07507b4691063f3a7322371f2e99d42c87f9..93a02516f4e309ecd0a70c08c6d5db3b5391a2fd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,10 @@ This is a changelog for Piwik platform developers. All changes for our HTTP API'
   * The following methods have been added: setPassword, setPasswordHash, getTokenAuthSecret and getLogin.
   * Clarifying semantics of each method and what they must support and can support.
   * **Read the documentation for the [Auth interface](http://developer.piwik.org/api-reference/Piwik/Auth) to learn more.**
+* The `Piwik\Unzip\*` classes have been extracted out of the Piwik repository into a separate component named [Decompress](https://github.com/piwik/component-decompress).
+  * `Piwik\Unzip` has not moved, it is kept for backward compatibility. If you have been using that class, you don't need to change anything.
+  * The `Piwik\Unzip\*` classes (Tar, PclZip, Gzip, ZipArchive) have moved to the `Piwik\Decompress\*` namespace (inside the new repository).
+  * `Piwik\Unzip\UncompressInterface` has been moved and renamed to `Piwik\Decompress\DecompressInterface` (inside the new repository).
 
 ### Deprecations
 * The Piwik::setUserHasSuperUserAccess method is deprecated, instead use Access::doAsSuperUser. This method will ensure that super user access is properly rescinded after the callback finishes.