diff --git a/bip-0155.mediawiki b/bip-0155.mediawiki
index b8a33e34b5..f3b0f347f3 100644
--- a/bip-0155.mediawiki
+++ b/bip-0155.mediawiki
@@ -7,7 +7,7 @@
   Type: Specification
   Assigned: 2019-02-27
   License: BSD-2-Clause
-  Version: 2.1.0
+  Version: 2.1.1
 </pre>
 
 ==Introduction==
@@ -145,7 +145,10 @@ For older peers, that did not emit <code>sendaddrv2</code>, keep sending the leg
 
 ==Reference implementation==
 
-The reference implementation is available at (to be done)
+Original reference implementation in Bitcoin Core:
+* https://github.com/bitcoin/bitcoin/issues/18884
+* https://github.com/bitcoin/bitcoin/pull/19954
+* https://github.com/bitcoin/bitcoin/pull/20119
 
 ==Acknowledgements==
 
@@ -196,6 +199,8 @@ Yggdrasil addresses are simply IPv6 addresses in the <code>0200::/7</code> range
 
 == Changelog ==
 
+* 2.1.1 (2026-08-08):
+** Add links to reference implementation.
 * 2.1.0 (2026-08-03):
 ** Document that IPv4-in-IPv6 range MUST NOT be sent with the IPV6 network ID and SHOULD be ignored on receive.
 * 2.0.0 (2025-10-01):