diff --git a/README.md b/README.md
index df3b690..3d6d5f0 100644
--- a/README.md
+++ b/README.md
@@ -72,13 +72,14 @@ jobs:
 
 ### Build
 
-| parameter | description                       | required | default              |
-| --------- | --------------------------------- | -------- | -------------------- |
-| registry  | The registry to upload to.        | false    | gcr.io               |
-| image     | The name of image to build.       | false    | `$GITHUB_REPOSITORY` |
-| tag       | The tag of the image.             | false    | `$GITHUB_SHA`        |
-| latest    | If true, will also add latest tag | true     | `true`               |
-| args      | Additional args for docker        | false    |                      |
+| parameter  | description                       | required | default              |
+| ---------  | --------------------------------- | -------- | -------------------- |
+| registry   | The registry to upload to.        | false    | gcr.io               |
+| image      | The name of image to build.       | false    | `$GITHUB_REPOSITORY` |
+| tag        | The tag of the image.             | false    | `$GITHUB_SHA`        |
+| latest     | If true, will also add latest tag | true     | `true`               |
+| args       | Additional args for docker        | false    |                      |
+| dockerfile | The Dockerfile to use             | false    | Dockerfile           |
 
 ### Push
 
diff --git a/build/action.yml b/build/action.yml
index db6c763..539e718 100644
--- a/build/action.yml
+++ b/build/action.yml
@@ -25,6 +25,10 @@ inputs:
     description: the context path
     required: true
     default: "."
+  dockerfile:
+    description: the Dockerfile to use
+    required: false
+    default: "Dockerfile"
 
 runs: 
   using: 'docker'
diff --git a/build/entrypoint.sh b/build/entrypoint.sh
index 857abe4..a021149 100644
--- a/build/entrypoint.sh
+++ b/build/entrypoint.sh
@@ -8,9 +8,10 @@ set -e
 : ${INPUT_TAG:=$GITHUB_SHA}
 : ${INPUT_LATEST:=true}
 : ${INPUT_PATH:=.}
+: ${INPUT_DOCKERFILE:=Dockerfile}
 
 
-docker build $INPUT_ARGS -t $INPUT_IMAGE:$INPUT_TAG $INPUT_PATH
+docker build $INPUT_ARGS -f $INPUT_DOCKERFILE -t $INPUT_IMAGE:$INPUT_TAG $INPUT_PATH
 docker tag $INPUT_IMAGE:$INPUT_TAG $INPUT_REGISTRY/$INPUT_IMAGE:$INPUT_TAG
 
 if [ $INPUT_LATEST = true ]; then