diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..7d48241
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,2 @@
+# Optional: Set a custom container name to run multiple instances
+# CONTAINER_NAME=nonograms-dev
diff --git a/docker-compose.yml b/docker-compose.yml
index 6a30f7d..b52c7a2 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -2,7 +2,7 @@ version: '3.8'
 
 services:
   nonograms:
-    container_name: nonograms
+    container_name: ${CONTAINER_NAME:-nonograms}
     build:
       context: .
       dockerfile: Dockerfile