diff --git a/docs/third_party.md b/docs/third_party.md
index b339c4f196..43112b82e4 100644
--- a/docs/third_party.md
+++ b/docs/third_party.md
@@ -150,6 +150,7 @@ GRPC (http://www.grpc.io/) is Google's RPC implementation for Protocol Buffers.
 * https://github.com/pbkit/npm-packages/blob/main/frpc-test/src/index.spec.ts (TypeScript Node.js/Browser)
 * https://github.com/ppissias/xsrpcj (Java)
 * https://github.com/twitchtv/twirp (Multiple languages)
+* https://github.com/icerpc/icerpc-csharp (C#)
 
 Inactive: