diff --git a/docs/requirements.md b/docs/requirements.md
index 4ead30dc8..f32eb70ef 100644
--- a/docs/requirements.md
+++ b/docs/requirements.md
@@ -32,17 +32,17 @@ If this command returns any results please remove or stop the application runnin
 
 If you have a firewall already up and running please make sure that these ports are open for incomming connections:
 
-| Service             | Protocol | Port   | Container       |
-| --------------------|:--------:|:-------|:----------------|
-| Postfix Submission  | TCP      | 587    | postfix-mailcow |
-| Postfix SMTPS       | TCP      | 465    | postfix-mailcow |
-| Postfix SMTP        | TCP      | 25     | postfix-mailcow |
-| Dovecot IMAP        | TCP      | 143    | dovecot-mailcow |
-| Dovecot IMAPS       | TCP      | 993    | dovecot-mailcow |
-| Dovecot POP3        | TCP      | 110    | dovecot-mailcow |
-| Dovecot POP3S       | TCP      | 995    | dovecot-mailcow |
-| Dovecot ManageSieve | TCP      | 4190   | dovecot-mailcow |
-| HTTP(S)             | TCP      | 80/443 | nginx-mailcow   |
+| Service             | Protocol | Port   | Container       | Variable                       |
+| --------------------|:--------:|:-------|:----------------|--------------------------------|
+| Postfix SMTP        | TCP      | 25     | postfix-mailcow | `${SMTP_PORT}`                 |
+| Postfix SMTPS       | TCP      | 465    | postfix-mailcow | `${SMTPS_PORT}`                |
+| Postfix Submission  | TCP      | 587    | postfix-mailcow | `${SUBMISSION_PORT}`           |
+| Dovecot IMAP        | TCP      | 143    | dovecot-mailcow | `${IMAP_PORT}`                 |
+| Dovecot IMAPS       | TCP      | 993    | dovecot-mailcow | `${IMAPS_PORT}`                |
+| Dovecot POP3        | TCP      | 110    | dovecot-mailcow | `${POP_PORT}`                  |
+| Dovecot POP3S       | TCP      | 995    | dovecot-mailcow | `${POPS_PORT}`                 |
+| Dovecot ManageSieve | TCP      | 4190   | dovecot-mailcow | `${SIEVE_PORT}`                |
+| HTTP(S)             | TCP      | 80/443 | nginx-mailcow   | `${HTTP_PORT}`/`${HTTPS_PORT}` |
 
 ## Enabling NTP services