diff --git a/ChangeLog b/ChangeLog
index 46b001c..44ad099 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -27,6 +27,9 @@
     * 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
    * "make apidoc" now generates the documentation for the current