diff --git a/firefetch/Dockerfile b/firefetch/Dockerfile
index 1b3d8bb..71ddae6 100644
--- a/firefetch/Dockerfile
+++ b/firefetch/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:20.13.1-alpine as app
+FROM node:20.13.1-alpine AS app
 WORKDIR /app
 COPY package.json package-lock.json ./
 RUN npm ci
diff --git a/firefetch/index.js b/firefetch/index.js
index f53543a..ac03b4c 100644
--- a/firefetch/index.js
+++ b/firefetch/index.js
@@ -122,6 +122,6 @@ async function downloadFromFirebase(remoteDir, localDir) {
 }
 
 // Usage
-const remoteDir = process.env.PROJECTID;
-const localDir = process.env.LOCALDIR;
+const remoteDir = process.env.PROJECTID; // example: code/prj_id
+const localDir = process.env.LOCALDIR; // example: your local directory
 downloadFromFirebase(remoteDir, localDir);