diff --git a/README.md b/README.md
index 5f9f265..0eae939 100644
--- a/README.md
+++ b/README.md
@@ -731,6 +731,7 @@ See also [About Rust’s Machine Learning Community](https://medium.com/@autumn_
 
 ### Authentication
 
+* [constantoine/totp-rs](https://github.com/constantoine/totp-rs) [[totp-rs](https://crates.io/crates/totp-rs)] — 2fa library to generate and verify TOTP-based tokens ![Build Status](https://github.com/constantoine/totp-rs/workflows/Rust/badge.svg)
 * [Keats/jsonwebtoken](https://github.com/Keats/jsonwebtoken) — [JSON Web Token](https://en.wikipedia.org/wiki/JSON_Web_Token) lib in rust  [![Build Status](https://api.travis-ci.org/Keats/jsonwebtoken.svg?branch=master)](https://travis-ci.org/Keats/jsonwebtoken)
 * [oauth2](https://github.com/ramosbugs/oauth2-rs) — Extensible, strongly-typed Rust OAuth2 client library [![Build Status](https://api.travis-ci.org/ramosbugs/oauth2-rs.svg?branch=main)](https://travis-ci.org/ramosbugs/oauth2-rs)
 * [oxide-auth](https://github.com/HeroicKatora/oxide-auth) — A OAuth2 server library, for use in combination with actix or other frontends, featuring a set of configurable and pluggable backends [![Build Status](https://api.cirrus-ci.com/github/HeroicKatora/oxide-auth.svg?branch=master)](https://cirrus-ci.com/github/HeroicKatora/oxide-auth)