diff --git a/core/CHANGELOG.txt b/core/CHANGELOG.txt
index e75b595..637ddbc 100644
--- a/core/CHANGELOG.txt
+++ b/core/CHANGELOG.txt
@@ -33,6 +33,9 @@ Drupal 8.3.0, 2017-04-05
     * REST API now supports anonymous registration requests.
     * Anonymous REST request performance increased by 60% by utilizing the page
       cache.
+    * Improved the response messages and status codes for requests with missing
+      or incorrect headers and wrong sent data.
+    * Massive overhaul of the test coverage.
 - Improved performance/scalability:
     * Optimized class loader detection made more generic to support class
       loaders other than ApcClassLoader.
@@ -45,6 +48,8 @@ Drupal 8.3.0, 2017-04-05
     * @todo: Switch to short array syntax https://www.drupal.org/node/2776975
 - Testing improvements:
     * Integrated PHPUnit verbose output in SimpleTest UI.
+    * Improved backward compatibility with WebTestBase.
+    * Enlargement of JS test coverage.
 
 Drupal 8.2.0, 2016-10-05
 ------------------------