diff --git a/ChangeLog b/ChangeLog
index 4ae8f7e..7dd3769 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -44,6 +44,10 @@
      to bypass the version verification check. Found by Peng Li/Yueh-Hsun Lin,
      KNOX Security, Samsung Research America
 
+Changes
+   * Avoid shadowing of time and index functions through mbed TLS function
+     arguments. Found by inestlerode. Fixes #557.
+
 = mbed TLS 2.1.8 branch released 2017-06-21
 
 Security