diff --git a/README.md b/README.md
index 37a2dc4..06bb021 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,5 @@
 GitHub Action for refreshing dummy self hosted runner.
-
-- Create or refresh dummy runner for target organization.
+The action creates or refreshes dummy runner for target organization or target repository.
 
 # Background
 
@@ -16,13 +15,13 @@ However, because dummy runner is always in offline status, GitHub sever will rem
 ## Inputs
 
 - Required
-  - `org-name`: Target organization name. (ex. cycloud-io)
+  - `org-name` or `repo-name`: Target organization or repository name.
+      - Either name must be specified. You can't set both.
+      - `org-name` example: cycloud-io
+      - `repo-name` example: cycloud-io/my-repo
   - `github-access-token`: GitHub access token to use.
       - You must prepare the GitHub access token. The GitHub Actions' **default token `secrets.GITHUB_TOKEN` won't work.**
-      - Following scope/permission is required depending on solutions you use:
-          - Personal Access Token: `admin:org` scope is required for the target organization.
-          - OAuth Apps: `admin:org` scope is required for the target organization.
-          - GitHub Apps: `organization_self_hosted_runners: write` permission for the target organization. ([REST API Link](https://docs.github.com/en/enterprise-server@3.0/rest/reference/apps#create-an-installation-access-token-for-an-app))
+      - Check required scope/permission for the token [here](#required-scopepermission).
       - Always use secret environment (ex. `${{ secrets.SECRET_NAME }}`). **NEVER SET THIS VALUE AS PLAIN TEXT.**
 - Optional
   - `runner-version`: Dummy runner version to use. If not specified, it will copy and use the version of the running runner.
@@ -35,10 +34,10 @@ For complete action definition, see [action.yaml](./action.yaml)
 
 Following GitHub Actions workflow example shows how to use `refresh-runner-action` in your repository's workflow.
 
-- For the first wokrlfow run, you must prepare your own dummy runner. Without it you can't run the workflow that uses `refresh-runner-action`.
-- You must set following field to appropriate values.
-    - org-name
-    - github-access-token
+- For the first wokrlfow run, you must prepare your own dummy runner. Without it you can't run the workflow that uses `refresh-runner-action`. See [official document](https://docs.github.com/en/enterprise-server@3.0/actions/hosting-your-own-runners/adding-self-hosted-runners) for detail.
+- You must set following fields to appropriate values.
+    - `org-name` or `repo-name` (Do not set both)
+    - `github-access-token`
 
 ```yaml
 name: refresh-dummy-runner
@@ -59,15 +58,33 @@ jobs:
       - name: Refresh runner
         uses: cycloud-io/refresh-runner-action@v1
         with:
-          # NOTE: Set to appropriate organization name.
+          # NOTE: Set either `org-name` or `repo-name`.
           org-name: cycloud-io
+          #repo-name: cycloud-io/my-repo
+
           # NOTE: Add `RUNNER_API_ACCESS_TOKEN` secret to the repository.
           github-access-token: ${{ secrets.RUNNER_API_ACCESS_TOKEN }}
 ```
 
 
-# Future Plan
+## Required scope/permission
+
+Following scope/permission is required for `github-access-token`.
+
+- Personal Access Token
+    - For `org-name` - `admin:org` scope is required for target organization.
+    - For `repo-name` - `repo` scope is required for target repository.
+
+- OAuth Apps 
+    - Same as Personal Access Token.
+
+- GitHub Apps 
+    - For `org-name` - `organization_self_hosted_runners: write` permission is required for target organization.
+    - For `repo-name` - `administration: write` permission is required for target repository.
+  
+
+Related Links:
 
-Following features will be added **if there are certain demands.**
+- [Self-hosted runner groups](https://docs.github.com/en/enterprise-server@3.0/rest/reference/actions#self-hosted-runner-groups)
+- [Create an installation access token for an app](https://docs.github.com/en/enterprise-server@3.0/rest/reference/apps#create-an-installation-access-token-for-an-app)
 
-- Support repository scope runner.
diff --git a/action.yaml b/action.yaml
index 8d3e1d5..de40cc2 100644
--- a/action.yaml
+++ b/action.yaml
@@ -4,8 +4,15 @@ description: Creates/Refreshes self hosted runner.
 inputs:
   ## Required Parameters
   org-name:
-    description: Target organization name.
-    required: true
+    description: Target organization name. Either org-name or repo-name must be specified.
+    default: ""
+    required: false
+  repo-name:
+    description: |
+      Target repository name. Repository name must include owner: `{owner}/{repo}`.
+      Either org-name or repo-name must be specified.
+    default: ""
+    required: false
   github-access-token:
     description: Github access token to use. Token should be personal access token or Github Apps generated token.
     required: true
@@ -13,7 +20,8 @@ inputs:
   ## Optional Parameters
   runner-version:
     description: |
-      Version of Github Self Hosted Runner. If not specified, it will use the version of the running runner. (NOTE: Architecture is fixed to "linux-x64")
+      Version of Github Self Hosted Runner. 
+      If not specified, it will use the version of the running runner. (NOTE: Architecture is fixed to "linux-x64")
     required: false
     default: ''
   runner-name:
@@ -30,6 +38,15 @@ runs:
         # Exit on error
         set -eu
 
+        if [ "${{ inputs.org-name }}" != "" ] &&  [ "${{ inputs.repo-name }}" != "" ]; then
+            echo "Error: Can't specify both org-name and repo-name."
+            exit 1
+        fi
+        if [ "${{ inputs.org-name }}" = "" ] && [ "${{ inputs.repo-name }}" = "" ]; then
+            echo "Error: Required to specify either org-name or repo-name."
+            exit 1
+        fi
+
         # Prepare dummy runner files
         mkdir actions-runner && cd actions-runner
         if [ "${{ inputs.runner-version }}" = "" ]; then
@@ -48,10 +65,19 @@ runs:
         echo "Prepared dummy runner version: $(./config.sh --version)"
 
         echo "### Configure dummy runner"
-        RUNNER_TOKEN=$(bash ${{ github.action_path }}/script/get-runner-token.sh ${{ inputs.github-access-token }} ${GITHUB_API_URL} ${{ inputs.org-name }} )
+        if [ "${{ inputs.org-name }}" != "" ]; then
+            echo "target org: ${{ inputs.org-name }}"
+            RUNNER_TOKEN=$(bash ${{ github.action_path }}/script/get-org-runner-token.sh ${{ inputs.github-access-token }} ${GITHUB_API_URL} ${{ inputs.org-name }} )
+            TARGET_NAME=${{ inputs.org-name }}
+        else
+            echo "target repository: ${{ inputs.repo-name }}"
+            RUNNER_TOKEN=$(bash ${{ github.action_path }}/script/get-repo-runner-token.sh ${{ inputs.github-access-token }} ${GITHUB_API_URL} ${{ inputs.repo-name }} )
+            TARGET_NAME=${{ inputs.repo-name }}
+        fi
+
         ./config.sh \
             --name ${{ inputs.runner-name }} \
-            --url ${GITHUB_SERVER_URL}/${{ inputs.org-name }} \
+            --url ${GITHUB_SERVER_URL}/${TARGET_NAME} \
             --token ${RUNNER_TOKEN} \
             --labels dummy-runner \
             --replace \
diff --git a/script/get-runner-token.sh b/script/get-org-runner-token.sh
similarity index 70%
rename from script/get-runner-token.sh
rename to script/get-org-runner-token.sh
index 54c827d..90dfb2f 100644
--- a/script/get-runner-token.sh
+++ b/script/get-org-runner-token.sh
@@ -1,10 +1,11 @@
 #!/bin/bash
-set -e
+set -eu
 
 RUNNER_API_ACCESS_TOKEN=$1
 API_URL=$2
 ORG_NAME=$3
 
+# API ref: https://docs.github.com/en/enterprise-server@3.0/rest/reference/actions#create-a-registration-token-for-an-organization
 RUNNER_TOKEN=$(curl -s \
         -X POST \
         -H "Accept: application/vnd.github.v3+json" \
diff --git a/script/get-repo-runner-token.sh b/script/get-repo-runner-token.sh
new file mode 100644
index 0000000..b00fb29
--- /dev/null
+++ b/script/get-repo-runner-token.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+set -eu
+
+RUNNER_API_ACCESS_TOKEN=$1
+API_URL=$2
+# Expects to be `{owner}/{repo}`
+REPO_NAME=$3
+
+# API ref: https://docs.github.com/en/enterprise-server@3.0/rest/reference/actions#create-a-registration-token-for-a-repository
+RUNNER_TOKEN=$(curl -s \
+        -X POST \
+        -H "Accept: application/vnd.github.v3+json" \
+        -H "authorization: Bearer ${RUNNER_API_ACCESS_TOKEN}" \
+        ${API_URL}/repos/${REPO_NAME}/actions/runners/registration-token \
+    | jq -r .token
+)
+echo -n $RUNNER_TOKEN
\ No newline at end of file