diff --git a/bsip-0017.md b/bsip-0017.md
index 9970133..dcd6b18 100644
--- a/bsip-0017.md
+++ b/bsip-0017.md
@@ -5,6 +5,7 @@
     Type: Protocol
     Created: 2016-10-27
     Discussion: https://bitsharestalk.org/index.php/topic,23334.0.html
+                https://github.com/cryptonomex/graphene/issues/664
     Copyright: Public Domain
 
 # Abstract