diff --git a/.gitignore b/.gitignore
index 5c82d99..7b79e86 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /apkovl/
 /cache/
 /dist/
+/megabit-armhf.tar.gz
diff --git a/README.md b/README.md
index eebbf02..899a9ba 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ bin/build
 ### SD カードに書き込み
 
 ```sh
-rsync -a dist/ /path/to/sd/
+tar xf megabit-armhf.tar.gz -C /path/to/sd/
 ```
 
 ### 前提条件
diff --git a/bin/build b/bin/build
index 1b2eef5..5c12b49 100755
--- a/bin/build
+++ b/bin/build
@@ -15,3 +15,4 @@ cp -a usercfg.txt cache -t dist
 gzip -cdk overlay.img.gz > dist/overlay.img
 docker-compose run --rm builder
 tar czf dist/localhost.apkovl.tar.gz --owner=0 --group=0 -C apkovl .
+tar czf megabit-armhf.tar.gz --owner=0 --group=0 -C dist .