diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index d4516f1..58e5726 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -14,6 +14,7 @@ services:
       DISABLE_IMPORTS: false # Will disable account imports
       DISABLE_EXPORTS: false # Will disable account exports
       #IMAGE_ASSET_PATH: /images/ # Images for cards in webui (will default to the public server)
+      #MASTERDATA: /masterdata/ # Override bundled asset lists / CSVs / new_user.json at runtime (missing files fall back to the internal copies)
 
       # Everything below is for the "Help" page
       #ANDROID_GLOBAL: "link.to/patched/android/global.apk"
@@ -28,4 +29,6 @@ services:
       # You can download from https://git.ethanthesleepy.one/ethanaobrien/ew-webui/releases/download/images/card-thumbnails.zip
       # No, you should not have a nested folder EXAMPLE: `images/FILENAME.webp`
       #- ./images:/images
+      # Mirrors the bundled layout: asset_lists/{Bundle,Movie,Sound}.json, csv/<table>.csv, csv-en/<table>.csv, userdata/new_user.json
+      #- ./masterdata:/masterdata
     restart: unless-stopped
diff --git a/docker/start.sh b/docker/start.sh
index a3b17e9..2a5ccef 100755
--- a/docker/start.sh
+++ b/docker/start.sh
@@ -27,4 +27,6 @@ asset_ios_en=$([ "$EN_IOS_ASSET_HASH" != "" ] && echo "--en-ios-asset-hash $EN_I
 
 image_asset_path=$([ "$IMAGE_ASSET_PATH" != "" ] && echo "--image-asset-path $IMAGE_ASSET_PATH" || echo "")
 
-/root/ew/ew --path $directory --port $port --npps4 $npps4 $asset_android_jp $asset_ios_jp $asset_android_en $asset_ios_en $exports $imports $purge $hidden $https $image_asset_path --global-android "$ANDROID_GLOBAL"  --japan-android "$ANDROID_JAPAN"  --global-ios "$IOS_GLOBAL"  --japan-ios "$IOS_JAPAN" --assets-url "$ASSET_URL" --max-time $maxTime
+masterdata=$([ "$MASTERDATA" != "" ] && echo "--masterdata $MASTERDATA" || echo "")
+
+/root/ew/ew --path $directory --port $port --npps4 $npps4 $asset_android_jp $asset_ios_jp $asset_android_en $asset_ios_en $exports $imports $purge $hidden $https $image_asset_path $masterdata --global-android "$ANDROID_GLOBAL"  --japan-android "$ANDROID_JAPAN"  --global-ios "$IOS_GLOBAL"  --japan-ios "$IOS_JAPAN" --assets-url "$ASSET_URL" --max-time $maxTime