diff --git a/tests/README.md b/tests/README.md
index 039c65b..c932a0e 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -10,7 +10,7 @@ docker-compose up
     - listen on :993, run `openssl s_client -connect 127.0.0.1:993`
     - login with `A LOGIN test pass`
   - Maddy
-    - listen on :994,  run `openssl s_client -connect 127.0.0.1:993`
+    - listen on :994,  run `openssl s_client -connect 127.0.0.1:994`
     - login with `A LOGIN test@example.com pass`
   - Cyrus
     - lient on :143, run `nc 127.0.0.1 143`
@@ -25,6 +25,9 @@ Other IMAP servers we could add:
     - https://wiki.archlinux.org/title/UW_IMAP
   - Apache James (has its own implementation of IMAP too)
     - https://james.apache.org/
+  - Citadel
+    - https://citadel.org
+    - https://code.citadel.org/?p=citadel;a=tree;f=citadel/server/modules/imap;h=3ceaa1d6b518bddb7539911a8dd9d81136d4e594;hb=HEAD
 
 # Inject emails and dump the computed `BODY` + `BODYSTRUCTURE`