diff --git a/ChangeLog b/ChangeLog
index 352124651..cf5ba2c4b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -19,7 +19,7 @@ Bugfix
    * Fixed cert_app sample program for debug output and for use when no root
      certificates are provided.
    * Fix conditional statement that would cause a 1 byte overread in
-     mbedtls_asn1_get_int(). Found and fixed by Guido Vranken.
+     mbedtls_asn1_get_int(). Found and fixed by Guido Vranken. #599
    * 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.