diff --git a/README.md b/README.md
index 6aef110..95217cc 100644
--- a/README.md
+++ b/README.md
@@ -31,10 +31,15 @@
 
     ```console
     $ touch .env
+
+    $ echo "HTTP_PORT=80" >> .env
+    $ echo "HTTPS_PORT=443" >> .env
     $ echo "BASE_URL=https://plausible.example.com" >> .env
     $ echo "SECRET_KEY_BASE=$(openssl rand -base64 48)" >> .env
     
     $ cat .env
+    HTTP_PORT=80
+    HTTPS_PORT=443 
     BASE_URL=https://plausible.example.com
     SECRET_KEY_BASE=As0fZsJlUpuFYSthRjT5Yflg/NlxkFKPRro72xMLXF8yInZ60s6xGGXYVqml+XN1
     ```
diff --git a/compose.yml b/compose.yml
index d8a9962..9ee7537 100644
--- a/compose.yml
+++ b/compose.yml
@@ -41,8 +41,8 @@ services:
         condition: service_healthy
     ports:
       # Note that setting ports opens firewall for external access.
-      - 80:80
-      - 443:443
+      - 80:${HTTP_PORT}
+      - 443:${HTTPS_PORT}
     volumes:
       - plausible-data:/var/lib/plausible
     ulimits:
@@ -52,8 +52,8 @@ services:
     environment:
       - BASE_URL=${BASE_URL}
       - SECRET_KEY_BASE=${SECRET_KEY_BASE}
-      - HTTP_PORT=80
-      - HTTPS_PORT=443
+      - HTTP_PORT
+      - HTTPS_PORT
 
 volumes:
   db-data: