diff --git a/src/server-app/java/README.md b/src/server-app/java/README.md
index fc4c000c..61b14f61 100644
--- a/src/server-app/java/README.md
+++ b/src/server-app/java/README.md
@@ -75,6 +75,8 @@ $ git clone git@github.com:iij/bootcamp.git
          - ./work:/work
        working_dir: /work
        tty: true
+       ports:
+        - "8080:8080"
    ```
 
 4. コンテナを起動する
diff --git a/src/server-app/java/server-app/docker-compose.yml b/src/server-app/java/server-app/docker-compose.yml
index 9f442232..b5a0389e 100644
--- a/src/server-app/java/server-app/docker-compose.yml
+++ b/src/server-app/java/server-app/docker-compose.yml
@@ -5,3 +5,5 @@ services:
       - ./work:/work
     working_dir: /work
     tty: true
+    ports:
+      - "8080:8080"