diff --git a/docs/middleware/third-party.md b/docs/middleware/third-party.md
index 6a1c4fa7..51751bc2 100644
--- a/docs/middleware/third-party.md
+++ b/docs/middleware/third-party.md
@@ -78,6 +78,7 @@ Most of this middleware leverages external libraries.
 - [Hono Rate Limiter](https://github.com/rhinobase/hono-rate-limiter)
 - [Hono Problem Details (RFC 9457)](https://github.com/paveg/hono-problem-details)
 - [Hono Simple DI](https://github.com/maou-shonen/hono-simple-DI)
+- [Idempotency (Stripe-style idempotency keys)](https://github.com/paveg/hono-idempotency)
 - [jsonv-ts (Validator, OpenAPI, MCP)](https://github.com/dswbx/jsonv-ts)
 - [MCP](https://github.com/honojs/middleware/tree/main/packages/mcp)
 - [RONIN (Database)](https://github.com/ronin-co/hono-client)