diff --git a/.eslintrc.yml b/.eslintrc.yml
index bbe1f10..07b4cfe 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -3,9 +3,9 @@ env: # https://eslint.org/docs/user-guide/configuring#specifying-environments
   es6: true
   node: true
 extends:
-  - eslint:recommended
-  - plugin:@typescript-eslint/eslint-recommended
-  - plugin:@typescript-eslint/recommended
+- eslint:recommended
+- plugin:@typescript-eslint/eslint-recommended
+- plugin:@typescript-eslint/recommended
 plugins:
 - import
 - "@typescript-eslint"
diff --git a/.github/workflows/verify-on-macos.yml b/.github/workflows/verify-on-macos.yml
index ff8daf5..469120b 100644
--- a/.github/workflows/verify-on-macos.yml
+++ b/.github/workflows/verify-on-macos.yml
@@ -12,7 +12,7 @@ jobs:
     - name: Install SSH key
       uses: ./.
       with:
-        private-key: ${{ secrets.SSH_KEY }}
+        key: ${{ secrets.SSH_KEY }}
         known_hosts: ${{ secrets.KNOWN_HOSTS }} # optional
     - name: print created files
       run: ls -l ~/.ssh
@@ -27,7 +27,7 @@ jobs:
     - name: Install SSH key
       uses: ./.
       with:
-        private-key: ${{ secrets.SSH_KEY }}
+        key: ${{ secrets.SSH_KEY }}
         known_hosts: ${{ secrets.KNOWN_HOSTS }} # optional
         name: ssh_key_name # optional
         config: | # optional
diff --git a/.github/workflows/verify-on-ubuntu.yml b/.github/workflows/verify-on-ubuntu.yml
index 84f5c45..e6548e1 100644
--- a/.github/workflows/verify-on-ubuntu.yml
+++ b/.github/workflows/verify-on-ubuntu.yml
@@ -12,7 +12,7 @@ jobs:
     - name: Install SSH key
       uses: ./.
       with:
-        private-key: ${{ secrets.SSH_KEY }}
+        key: ${{ secrets.SSH_KEY }}
         known_hosts: ${{ secrets.KNOWN_HOSTS }} # optional
     - name: print created files
       run: ls -l ~/.ssh
@@ -27,7 +27,7 @@ jobs:
     - name: Install SSH key
       uses: ./.
       with:
-        private-key: ${{ secrets.SSH_KEY }}
+        key: ${{ secrets.SSH_KEY }}
         known_hosts: ${{ secrets.KNOWN_HOSTS }} # optional
         name: ssh_key_name # optional
         config: | # optional
diff --git a/.github/workflows/verify-on-ubuntu1604.yml b/.github/workflows/verify-on-ubuntu1604.yml
index bd2c085..b3cce08 100644
--- a/.github/workflows/verify-on-ubuntu1604.yml
+++ b/.github/workflows/verify-on-ubuntu1604.yml
@@ -12,7 +12,7 @@ jobs:
     - name: Install SSH key
       uses: ./.
       with:
-        private-key: ${{ secrets.SSH_KEY }}
+        key: ${{ secrets.SSH_KEY }}
         known_hosts: ${{ secrets.KNOWN_HOSTS }} # optional
     - name: print created files
       run: ls -l ~/.ssh
@@ -27,7 +27,7 @@ jobs:
     - name: Install SSH key
       uses: ./.
       with:
-        private-key: ${{ secrets.SSH_KEY }}
+        key: ${{ secrets.SSH_KEY }}
         known_hosts: ${{ secrets.KNOWN_HOSTS }} # optional
         name: ssh_key_name # optional
         config: | # optional
diff --git a/.github/workflows/verify-on-windows.yml b/.github/workflows/verify-on-windows.yml
index 615be88..003466f 100644
--- a/.github/workflows/verify-on-windows.yml
+++ b/.github/workflows/verify-on-windows.yml
@@ -12,7 +12,7 @@ jobs:
     - name: Install SSH key
       uses: ./.
       with:
-        private-key: ${{ secrets.SSH_KEY }}
+        key: ${{ secrets.SSH_KEY }}
         known_hosts: ${{ secrets.KNOWN_HOSTS }} # optional
     - name: print created files
       run: ls ~/.ssh
@@ -27,7 +27,7 @@ jobs:
     - name: Install SSH key
       uses: ./.
       with:
-        private-key: ${{ secrets.SSH_KEY }}
+        key: ${{ secrets.SSH_KEY }}
         known_hosts: ${{ secrets.KNOWN_HOSTS }} # optional
         name: ssh_key_name # optional
         config: | # optional
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c3519a4..55bebe3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Changed
 
+* rename `private-key` to `key`
 * rename `known-hosts` to `known_hosts`
 
 ## [1.6.4] - 2020-01-27
diff --git a/README.md b/README.md
index 0fd7f60..ac298dc 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ steps:
 - name: Install SSH key
   uses: shimataro/ssh-key-action@v1
   with:
-    private-key: ${{ secrets.SSH_KEY }}
+    key: ${{ secrets.SSH_KEY }}
     name: id_rsa # optional
     known_hosts: ${{ secrets.KNOWN_HOSTS }} # optional
     config: ${{ secrets.CONFIG }} # ssh_config; optional
@@ -42,7 +42,7 @@ See [Workflow syntax for GitHub Actions](https://help.github.com/en/articles/wor
 If you want to install multiple keys, call this action multiple times.
 It is useful for port forwarding.
 
-**NOTE:**  When this action is called multiple times, **the contents of `known_hosts` and `config` will be appended**. `private-key` must be saved as different name, by using `name` option.
+**NOTE:**  When this action is called multiple times, **the contents of `known_hosts` and `config` will be appended**. `key` must be saved as different name, by using `name` option.
 
 ```yaml
 runs-on: ubuntu-latest
@@ -50,7 +50,7 @@ steps:
 - name: Install SSH key of bastion
   uses: shimataro/ssh-key-action@v1
   with:
-    private-key: ${{ secrets.SSH_KEY_OF_BASTION }}
+    key: ${{ secrets.SSH_KEY_OF_BASTION }}
     name: id_rsa-bastion
     known_hosts: ${{ secrets.KNOWN_HOSTS_OF_BASTION }}
     config: |
@@ -61,7 +61,7 @@ steps:
 - name: Install SSH key of target
   uses: shimataro/ssh-key-action@v1
   with:
-    private-key: ${{ secrets.SSH_KEY_OF_TARGET }}
+    key: ${{ secrets.SSH_KEY_OF_TARGET }}
     name: id_rsa-target
     known_hosts: ${{ secrets.KNOWN_HOSTS_OF_TARGET }} # will be appended!
     config: |                                         # will be appended!
@@ -126,15 +126,15 @@ The scripts and documentation in this project are released under the [MIT Licens
 See [CHANGELOG.md](CHANGELOG.md).
 
 [image-build]: https://github.com/shimataro/ssh-key-action/workflows/Build/badge.svg?event=push&branch=v1
-[link-build]: https://github.com/shimataro/ssh-key-action
+[link-build]: https://github.com/shimataro/ssh-key-action/actions?query=workflow%3ABuild
 [image-verify-windows]: https://github.com/shimataro/ssh-key-action/workflows/Windows/badge.svg?event=push&branch=v1
-[link-verify-windows]: https://github.com/shimataro/ssh-key-action
+[link-verify-windows]: https://github.com/shimataro/ssh-key-action/actions?query=workflow%3AWindows
 [image-verify-macos]: https://github.com/shimataro/ssh-key-action/workflows/macOS/badge.svg?event=push&branch=v1
-[link-verify-macos]: https://github.com/shimataro/ssh-key-action
+[link-verify-macos]: https://github.com/shimataro/ssh-key-action/actions?query=workflow%3AmacOS
 [image-verify-ubuntu]: https://github.com/shimataro/ssh-key-action/workflows/Ubuntu/badge.svg?event=push&branch=v1
-[link-verify-ubuntu]: https://github.com/shimataro/ssh-key-action
+[link-verify-ubuntu]: https://github.com/shimataro/ssh-key-action/actions?query=workflow%3AUbuntu
 [image-verify-ubuntu1604]: https://github.com/shimataro/ssh-key-action/workflows/Ubuntu%2016.04/badge.svg?event=push&branch=v1
-[link-verify-ubuntu1604]: https://github.com/shimataro/ssh-key-action
+[link-verify-ubuntu1604]: https://github.com/shimataro/ssh-key-action/actions?query=workflow%3A%22Ubuntu+16.04%22
 [image-release]: https://img.shields.io/github/release/shimataro/ssh-key-action.svg
 [link-release]: https://github.com/shimataro/ssh-key-action/releases
 [image-license]: https://img.shields.io/github/license/shimataro/ssh-key-action.svg
diff --git a/action.yml b/action.yml
index c786c48..aef5b4e 100644
--- a/action.yml
+++ b/action.yml
@@ -6,8 +6,8 @@ branding:
   icon: "terminal"
   color: "gray-dark"
 inputs:
-  private-key:
-    description: "private SSH key"
+  key:
+    description: "SSH private key"
     required: true
   name:
     description: "SSH key file name (default: id_rsa)"
diff --git a/lib/main.js b/lib/main.js
index 7ec4714..b97cccb 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -18,7 +18,7 @@ function main() {
         const files = [
             {
                 name: core.getInput("name"),
-                contents: core.getInput("private-key", {
+                contents: core.getInput("key", {
                     required: true,
                 }),
                 options: {
diff --git a/lib/main.js.map b/lib/main.js.map
index 6148a6d..43bb0e4 100644
--- a/lib/main.js.map
+++ b/lib/main.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"main.js","sourceRoot":"","sources":["../src/main.ts"],"names":[],"mappings":";;;;;;;;;AAAA,uCAAyB;AACzB,2CAA6B;AAE7B,oDAAsC;AAStC;;GAEG;AACH,SAAS,IAAI;IAEZ,IACA;QACC,MAAM,KAAK,GAAe;YACzB;gBACC,IAAI,EAAE,IAAI,CAAC,QAAQ,CAAC,MAAM,CAAC;gBAC3B,QAAQ,EAAE,IAAI,CAAC,QAAQ,CAAC,KAAK,EAAE;oBAC9B,QAAQ,EAAE,IAAI;iBACd,CAAC;gBACF,OAAO,EAAE;oBACR,IAAI,EAAE,KAAK;oBACX,IAAI,EAAE,IAAI;iBACV;aACD;YACD;gBACC,IAAI,EAAE,aAAa;gBACnB,QAAQ,EAAE,SAAS,CAAC,IAAI,CAAC,QAAQ,CAAC,aAAa,CAAC,CAAC;gBACjD,OAAO,EAAE;oBACR,IAAI,EAAE,KAAK;oBACX,IAAI,EAAE,GAAG;iBACT;aACD;YACD;gBACC,IAAI,EAAE,QAAQ;gBACd,QAAQ,EAAE,SAAS,CAAC,IAAI,CAAC,QAAQ,CAAC,QAAQ,CAAC,CAAC;gBAC5C,OAAO,EAAE;oBACR,IAAI,EAAE,KAAK;oBACX,IAAI,EAAE,GAAG;iBACT;aACD;SACD,CAAC;QAEF,0BAA0B;QAC1B,MAAM,IAAI,GAAG,gBAAgB,EAAE,CAAC;QAChC,MAAM,OAAO,GAAG,IAAI,CAAC,OAAO,CAAC,IAAI,EAAE,MAAM,CAAC,CAAC;QAC3C,EAAE,CAAC,SAAS,CAAC,OAAO,EAAE;YACrB,SAAS,EAAE,IAAI;YACf,IAAI,EAAE,KAAK;SACX,CAAC,CAAC;QAEH,eAAe;QACf,KAAI,MAAM,IAAI,IAAI,KAAK,EACvB;YACC,MAAM,QAAQ,GAAG,IAAI,CAAC,IAAI,CAAC,OAAO,EAAE,IAAI,CAAC,IAAI,CAAC,CAAC;YAC/C,EAAE,CAAC,aAAa,CAAC,QAAQ,EAAE,IAAI,CAAC,QAAQ,EAAE,IAAI,CAAC,OAAO,CAAC,CAAC;SACxD;QAED,OAAO,CAAC,GAAG,CAAC,8BAA8B,OAAO,gBAAgB,CAAC,CAAC;KACnE;IACD,OAAM,GAAG,EACT;QACC,IAAI,CAAC,SAAS,CAAC,GAAG,CAAC,OAAO,CAAC,CAAC;KAC5B;AACF,CAAC;AAED;;;GAGG;AACH,SAAS,gBAAgB;IAExB,MAAM,OAAO,GAAG,UAAU,EAAE,CAAC;IAC7B,MAAM,IAAI,GAAG,OAAO,CAAC,GAAG,CAAC,OAAO,CAAC,CAAC;IAClC,IAAG,IAAI,KAAK,SAAS,EACrB;QACC,MAAM,KAAK,CAAC,GAAG,OAAO,iBAAiB,CAAC,CAAC;KACzC;IAED,OAAO,IAAI,CAAC;AACb,CAAC;AAED;;;GAGG;AACH,SAAS,UAAU;IAElB,IAAG,OAAO,CAAC,QAAQ,KAAK,OAAO,EAC/B;QACC,UAAU;QACV,OAAO,aAAa,CAAC;KACrB;IAED,gBAAgB;IAChB,OAAO,MAAM,CAAC;AACf,CAAC;AAED;;;;GAIG;AACH,SAAS,SAAS,CAAC,KAAa;IAE/B,IAAG,KAAK,CAAC,MAAM,KAAK,CAAC,EACrB;QACC,sBAAsB;QACtB,OAAO,EAAE,CAAC;KACV;IAED,OAAO,KAAK,KAAK,EAAE,CAAC;AACrB,CAAC;AAED,IAAI,EAAE,CAAC"}
\ No newline at end of file
diff --git a/src/main.ts b/src/main.ts
index 0eb46bd..b3aa60c 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -20,7 +20,7 @@ function main(): void
 		const files: FileInfo[] = [
 			{
 				name: core.getInput("name"),
-				contents: core.getInput("private-key", {
+				contents: core.getInput("key", {
 					required: true,
 				}),
 				options: {