diff --git a/zip-0032.rst b/zip-0032.rst
index b6f4e534..67a80822 100644
--- a/zip-0032.rst
+++ b/zip-0032.rst
@@ -464,7 +464,10 @@ TBC
 Reference Implementation
 ========================
 
-https://github.com/zcash/zcash/pull/XXXX
+* https://github.com/zcash-hackworks/zip32
+* https://github.com/zcash/librustzcash/pull/29
+* https://github.com/zcash/zcash/pull/3447
+* https://github.com/zcash/zcash/pull/3492
 
 
 References