diff --git a/ChangeLog b/ChangeLog
index e7a23ae..b85abf3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -21,6 +21,9 @@
    * Zeroize memory used for reassembling handshake messages after use.
    * Use `mbedtls_zeroize()` instead of `memset()` for zeroization of
      sensitive data in the example programs aescrypt2 and crypt_and_hash.
+   * 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.
 
 Changes
    * Add tests for session resumption in DTLS.