diff --git a/self_hosting/services/ejabberd/README.md b/self_hosting/services/ejabberd/README.md
index f896dca..55758e1 100644
--- a/self_hosting/services/ejabberd/README.md
+++ b/self_hosting/services/ejabberd/README.md
@@ -2,6 +2,7 @@
 
 These are the ports needed for ejabberd to work.
 Ports 80 and 443 are needed for deploying and SSL certificate with certbot.
+Read more about ports in [ejabberd's docs](https://docs.ejabberd.im/admin/guide/security)
 
 ```shell
 declare -a ports=("80" "443" "5222" "5223" "5269" "5280" "5443" "1883" "8883" "3478" "5349" "7777")