Add ChangeLog entry
diff --git a/ChangeLog b/ChangeLog
index 8db0215..ebcde96 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
mbed TLS ChangeLog (Sorted per branch, date)
+= mbed TLS 2.7.x feature branch released xxxx-xx-xx
+
+Features
+ * Add support for opaque keys in the pk module. Applications can define
+ opaque key engines to perform operations using keys stored in an
+ external cryptographic module.
+ * Support opaque private keys in TLS.
+
= mbed TLS 2.7.0 branch released 2018-02-03
Security