diff --git a/ChangeLog b/ChangeLog
index 82782e1..e5b6a24 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -46,6 +46,9 @@
    * Fix an unsafe bounds check when restoring an SSL session from a ticket.
      This could lead to a buffer overflow, but only in case ticket authentication
      was broken. Reported and fix suggested by Guido Vranken in #659.
+   * Add explicit integer to enumeration type casts to example program
+     programs/pkey/gen_key which previously led to compilation failure
+     on some toolchains. Reported by phoenixmcallister. Fixes #2170.
 
 = mbed TLS 2.14.0 branch released 2018-11-19