diff --git a/README.md b/README.md
index a9506d8..896cee6 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ cd acsmnode
    - Ensure the file is excluded from version control by adding .env to your .gitignore and .dockerignore files.
 4. Open **Docker Desktop**, then build the container image:
    ```bash
-   docker build -t datachain_processor .
+   docker build -f Dockerfile.acsmchain -t datachain_processor .
    ```
 5. Run the app:
    ```bash