Allow alternate implementation of GCM
Provide the ability to use an alternative implementation of GCM in place
of the library-provided implementation.
diff --git a/ChangeLog b/ChangeLog
index 227faed..d383308 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
mbed TLS ChangeLog (Sorted per branch, date)
+= mbed TLS x.x.x branch released xxxx-xx-xx
+
+Features
+ * Add support for alternative implementations of GCM, selected by the
+ configuration flag MBEDTLS_GCM_ALT in config.h
+
= mbed TLS 2.6.0 branch released 2017-08-10
Security
