diff --git a/docs/releasenotes.md b/docs/releasenotes.md
index 3da4d2d..059ca9f 100644
--- a/docs/releasenotes.md
+++ b/docs/releasenotes.md
@@ -2,7 +2,7 @@
 
 ## unreleased
 
-- support sub`[SubService]` (imports one interface inside another top-level service interface) (#206 via meirkr; also )
+- support sub`[SubService]` (imports one interface inside another top-level service interface) (#206 via meirkr; also protobuf-net #859)
 - automatically resolve Google.Protobuf `IMessage` types used in APIs
 
 ## 1.0.171