diff --git a/README.md b/README.md
index 6d1d0bb..ae3074d 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,10 @@ jobs:
         uses: actions/checkout@v1
       -
         name: Run build-tools build command
-        uses: buildtools/build-action@v1
+        uses: buildtool/build-action@v1
+        with:
+          dockerfile: dockerfiles/Dockerfile.build
+          docker-build-args: '--build-arg abc=123'
 ```
 
 ## Customizing
@@ -40,10 +43,14 @@ jobs:
 
 Following inputs can be used as `step.with` keys
 
-| Name                      | Type    | Default   | Description                              |
-|---------------------------|---------|-----------|------------------------------------------|
-| ` additional-docker-args` | String  |           | Extra arguments to `docker build`, supports  `-f <Dockerfile>` and multiple `--build-arg <KEY>=<VALUE>` params  |
+| Name                      | Type    | Default         | Description                                   |
+|---------------------------|---------|-----------------|-----------------------------------------------|
+| ` dockerfile`             | String  | `Dockerfile`    | To use a specific Dockerfile in your project  |
+| ` docker-build-args`      | String  |                 | Docker [build-arg]                            |
+
 
 ## License
 
-MIT. See `LICENSE` for more details.
\ No newline at end of file
+MIT. See `LICENSE` for more details.
+
+[build-arg]: https://docs.docker.com/engine/reference/commandline/#set-build-time-variables---build-arg
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diff --git a/action.yml b/action.yml
index 1a1952a..41d1424 100644
--- a/action.yml
+++ b/action.yml
@@ -1,14 +1,19 @@
 name: 'GitHub Action for Build'
 description: 'Build docker image'
 inputs:
-  additional-docker-args:
-    description: 'extra docker arguments'
+  dockerfile:
+    description: 'specify Dockerfile to use'
+    required: false
+    default: 'Dockerfile'
+  docker-build-args:
+    description: 'docker build-args arguments'
     required: false
 runs:
   using: 'docker'
   image: 'Dockerfile'
   args:
-    - ${{ inputs.additional-docker-args }}
+    - -f ${{ inputs.dockerfile }}
+    - ${{ inputs.docker-build-args }}
 branding:
   icon: 'package'
   color: 'green'
\ No newline at end of file