Update Changelog for fix #559
diff --git a/ChangeLog b/ChangeLog
index 489c4bf..8e25526 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -31,6 +31,9 @@
a contribution from Tobias Tangemann. #541
* Fixed cert_app sample program for debug output and for use when no root
certificates are provided.
+ * Fixed sample application 'programs/pkey/gen_key.c' for builds where the
+ configuration MBEDTLS_PEM_WRITE_C is not defined. Found by inestlerode.
+ #559.
Changes
* Extended test coverage of special cases, and added new timing test suite.