diff --git a/config.example.env b/config.example.env
index b6202c46fe..95ea976814 100644
--- a/config.example.env
+++ b/config.example.env
@@ -75,6 +75,10 @@ REDIS_TLS_SENTINEL_MODE=false
 
 DISABLE_SIGNUP=false
 
+# Hostnames. Usually does not need to change. 
+PROBE_API_HOSTNAME=probe-api:3400
+
+
 #Ports. Usually they don't need to change. 
 DASHBOARD_API_PORT=3002
 API_DOCS_PORT=1445
@@ -96,6 +100,7 @@ DASHBOARD_PORT=3009
 ADMIN_DASHBOARD_PORT=3158
 
 
+
 # Internal SMTP Server - Haraka
 
 USE_INTERNAL_SMTP=false