diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f00affe..d0b5d48 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,5 +1,4 @@
 on:
-  push:
   pull_request:
     branches:
       - master
@@ -11,7 +10,7 @@ jobs:
       - uses: actions/checkout@v2
       - name: check version
         id: check
-        uses: chroju/terraform-cloud-updater@master
+        uses: chroju/terraform-cloud-updater@v1
         with:
           working_dir: ./test
           comment_pr: true
@@ -27,10 +26,10 @@ jobs:
       - uses: actions/checkout@v2
       - name: check version
         id: check
-        uses: chroju/terraform-cloud-updater@master
+        uses: chroju/terraform-cloud-updater@v1
         with:
           working_dir: ./test
-          force_update: true
+          auto_update: true
           comment_pr: true
         env:
           TFE_TOKEN: ${{ secrets.TFE_TOKEN }}
diff --git a/README.md b/README.md
index 80f5870..d64e568 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,76 @@
 terraform-cloud-updater
 ======
+
+This action automates the terraform version update of your Terraform cloud workspace, based on the remote config file.
+
+## Usage
+
+This action parses the remote config file and checks which Terraform version is configured in your Terraform cloud workspace. If the latest Terraform version is not set, it will notice. It is also possible to automatically update the latest version.
+
+For example, if you use `. /terraform` directory, including the following remote config file.
+
+```hcl
+terraform {
+  backend "remote" {
+    hostname = "app.terraform.io"
+    organization = "sample"
+
+    workspaces {
+      name = "sample"
+    }
+  }
+  required_version = "> 0.12.0, <= 0.12.23"
+}
+```
+
+GitHub Actions are configuread as follows.
+
+```yaml
+on:
+  push:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  tf_cloud_update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: check update
+        id: check
+        uses: chroju/terraform-cloud-updater@v1
+        with:
+          working_dir: ./terraform
+          comment_pr: true
+        env:
+          TFE_TOKEN: ${{ secrets.TFE_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: result
+        run: echo "${{ steps.check.outputs.result }}"
+        if: "${{ steps.check.outputs.is_available_update == 'true' }}"
+```
+
+When action finds a new version, it will comment on the pull request. Action will also check for consistency with the required version and will not automatically update to a non-conforming version (In this case, it will not be updated to `0.12.24` ). Sample pull request is [here](https://github.com/chroju/terraform-cloud-updater/pull/17).
+
+## Inputs
+
+* `working_dir` - (Optional) Terraform working directory. Defaults to `./` (root of the GitHub repository) .
+* `auto_update` - (Optional) Not only notice, automatically update Terraform Cloud workspace to the latest version compatible with required version. Defaults to `false` .
+* `comment_pr` - (Optional) Whether or not to post a comment on GitHub pull requests. If you set it to true, you need to set the `GITHUB_TOKEN` environment variable. Defaults to `false` .
+
+## Outputs
+
+* `is_available_update` - Wherther or not available update ('true' or 'false') .
+* `output` - result message (empty if new version is not released) .
+
+## Environment Variables
+
+* `TFE_TOKEN` - (Required) Terraform Cloud API token.
+* `GITHUB_TOKEN` -  (Optional) The GitHub API token used to post comments to pull requests. Not required if the `comment_pr` input is set to `false` .
+
+## Notes
+
+### Support for Terraform Enterprise
+
+Since Terraform Cloud and Terraform Enterprise have a common API, this action is likely to be available for Terraform Enterprise as well. However, we have not verified the operation using Terraform Enterprise.
diff --git a/action.yml b/action.yml
index 2a987ee..5ce3db3 100644
--- a/action.yml
+++ b/action.yml
@@ -8,8 +8,8 @@ inputs:
   working_dir:
     description: "Terraform working directory"
     default: "./"
-  force_update:
-    description: "Force to update the latest version compatible with required versions"
+  auto_update:
+    description: "Whether automatically update Terraform Cloud workspace to the latest version compatible with required version"
     default: false
   comment_pr:
     description: "Whether or not to post a comment on GitHub pull requests"
diff --git a/entrypoint.sh b/entrypoint.sh
index 821b300..f073f77 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -2,7 +2,7 @@
 
 function parseInputs {
     subcommand="check"
-    if [[ "${INPUT_FORCE_UPDATE}" == "true" ]]; then
+    if [[ "${INPUT_AUTO_UPDATE}" == "true" ]]; then
         subcommand="update latest"
     elif [[ -n "${INPUT_SPECIFIC_VERSION}" ]]; then
         subcommand="update ${INPUT_SPECIFIC_VERSION}"