diff --git a/README.md b/README.md
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+++ b/README.md
@@ -108,6 +108,7 @@ Repo mirrors:
 - [Denoscuri](https://github.com/caranatar/denoscuri) (Typescript) - simple Gemini server written using Deno and Typescript.
 - [Dʒɛmɪni](https://sr.ht/~rwv/dezhemini/) (Racket) - server with features like SNI and CGI.
 - [Diamant](https://git.umaneti.net/diamant/) (Ruby) - simple Gemini server for static files.
+- [Doppio](https://github.com/bhavanki/doppio) (Java) - single-JAR Gemini server with CGI, authentication, and Atom feed support.
 - [Duckling proxy 🦆](https://portal.mozz.us/gemini/gemini.marmaladefoo.com/blog/31-Aug-2020_The_Duckling_Proxy.gmi) (Go) - scheme-specific filtering proxy for Gemini clients to access the web.
 - [Earl Server](https://github.com/mrletourneau/EarlServer) (Kotlin) - Gemini fileserver for the JVM.
 - [Ergol](http://adele.work/code/ergol/ergol.gmi) (PHP) - light Gemini server able to host several capsules with different cerificates.