diff --git a/docs/third_party.md b/docs/third_party.md
index 3f73d89c2a..0963fe2ff5 100644
--- a/docs/third_party.md
+++ b/docs/third_party.md
@@ -58,6 +58,7 @@ These are projects we know about implementing Protocol Buffers for other program
 * Javascript: http://code.google.com/p/protobuf-for-node/
 * Javascript: http://code.google.com/p/protostuff/
 * Julia: https://github.com/tanmaykm/ProtoBuf.jl
+* Kotlin: https://github.com/Kotlin/kotlinx.serialization
 * Lua: http://code.google.com/p/protoc-gen-lua/
 * Lua: http://github.com/indygreg/lua-protobuf
 * Lua: https://github.com/Neopallium/lua-pb