Update Changelog for fix #559
diff --git a/ChangeLog b/ChangeLog
index ee6c1f9..568fba1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -49,6 +49,9 @@
* Fix for key exchanges based on ECDH-RSA or ECDH-ECDSA which weren't
enabled unless others were also present. Found by David Fernandez. #428
* Fixed configuration of debug output in cert_app sample program.
+ * Fixed the sample applications gen_key.c, cert_req.c and cert_write.c for
+ builds where the configuration POLARSSL_PEM_WRITE_C is not defined. Found
+ by inestlerode. #559.
= mbed TLS 1.3.17 branch 2016-06-28