diff --git a/README.md b/README.md
index e09630b..52dc0d5 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ Docker registry (**default: Docker Hub's registry**).
 
 ### `image_tag`
 
-**Required** Tag of the image to build.
+Tag of the image to build (**default: latest**).
 
 ### `context`
 
@@ -42,10 +42,9 @@ None
 ## Example usage
 
 ```yml
-  - uses: ./.github/actions/build-and-push-with-cache
+  - uses: whoan/docker-build-with-cache-action@master
     with:
       docker_username: "${{ secrets.DOCKER_USERNAME }}"
       docker_password: "${{ secrets.DOCKER_PASSWORD }}"
       image_name: ${{ github.actor }}/node
-      image_tag: alpine-slim
 ```
diff --git a/action.yml b/action.yml
index 74fbd24..2d6cb6a 100644
--- a/action.yml
+++ b/action.yml
@@ -18,8 +18,9 @@ inputs:
     description: Name of the image to build
     required: true
   image_tag:
-    description: Tag of the image to build
-    required: true
+    description: "(Optional) Tag of the image to build (default: latest)"
+    required: false
+    default: latest
   context:
     description: "(Optional) Docker context (default: ./)"
     required: false