diff --git a/ChangeLog b/ChangeLog
index bde4177846..57a573592a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -32,7 +32,7 @@ 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 pthread implementation to avoid unintended double initialisations
      and double frees. (found by Niklas Amnebratt)
    * Fixed the sample applications gen_key.c, cert_req.c and cert_write.c for