Update subscription-templates.md

docs/subscription-templating/subscription-templates.md

@@ -53,6 +53,8 @@ services:
             - SUBSCRIPTION_PAGE_PORT=3010
             - META_TITLE="Subscription Page Title"
             - META_DESCRIPTION="Subscription Page Description"
+        // highlight-next-line-green
+            - CUSTOM_SUB_PREFIX=custom
         ports:
             - '127.0.0.1:3010:3010'
         networks:
@@ -70,6 +72,14 @@ Please, replace `panel.com` with URL which Remnawave Dashboard is available at.
 
 :::
 
+:::tip
+
+You can replace the `- CUSTOM_SUB_PREFIX=custom` parameter with, for example, `- CUSTOM_SUB_PREFIX=sub` to get an additional nested path for the subscription page.
+But in that case, in `.env` for the `remnawave` container, you will need to set the corresponding parameter correctly: `SUB_PUBLIC_DOMAIN=link.domain.com/sub`.
+And you will need to specify similar changes to the valid path in your configurations for nginx or caddy.
+
+:::
+
 ### Step 3: Start the container
 
 ```bash