Update Changelog for X.509 unrecognised field fix
diff --git a/ChangeLog b/ChangeLog
index 87768ff..c242d1f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -61,6 +61,8 @@
naming collision in projects which also have files with the common name
net.c. For consistency, the corresponding header file, net.h, is marked as
deprecated, and its contents moved to net_sockets.h.
+ * Changed the strategy for X.509 certificate parsing and validation, to no
+ longer disregard certificates with unrecognised fields.
= mbed TLS 2.3.0 branch released 2016-06-28
