diff --git a/ChangeLog b/ChangeLog
index 2bd0be9..7b08a54 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,9 @@
    * Fix memory leak in mbedtls_ssl_set_hostname() when called multiple times.
      Found by projectgus and jethrogb, #836.
 
+Features
+   * Allow comments in test data files.
+
 = mbed TLS 2.1.9 branch released 2017-08-10
 
 Security