diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5eb72b8..1b945ae 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,7 +1,11 @@
 # https://help.github.com/en/articles/workflow-syntax-for-github-actions
 
-on: push
 name: Build
+
+on:
+- push
+- pull_request
+
 jobs:
   build:
     name: Build on ${{ matrix.os }} / Node.js v${{ matrix.nodejs }}
diff --git a/.github/workflows/verify-on-macos.yml b/.github/workflows/verify-on-macos.yml
index f4621b4..274b1e1 100644
--- a/.github/workflows/verify-on-macos.yml
+++ b/.github/workflows/verify-on-macos.yml
@@ -1,7 +1,11 @@
 # https://help.github.com/en/articles/workflow-syntax-for-github-actions
 
-on: push
 name: macOS
+
+on:
+- push
+- pull_request
+
 jobs:
   ssh:
     name: Connect to github.com
diff --git a/.github/workflows/verify-on-ubuntu.yml b/.github/workflows/verify-on-ubuntu.yml
index 6577545..2400e1e 100644
--- a/.github/workflows/verify-on-ubuntu.yml
+++ b/.github/workflows/verify-on-ubuntu.yml
@@ -1,7 +1,11 @@
 # https://help.github.com/en/articles/workflow-syntax-for-github-actions
 
-on: push
 name: Ubuntu
+
+on:
+- push
+- pull_request
+
 jobs:
   ssh:
     name: Connect to github.com
diff --git a/.github/workflows/verify-on-ubuntu1604.yml b/.github/workflows/verify-on-ubuntu1604.yml
index a9d0fb6..01efc32 100644
--- a/.github/workflows/verify-on-ubuntu1604.yml
+++ b/.github/workflows/verify-on-ubuntu1604.yml
@@ -1,7 +1,11 @@
 # https://help.github.com/en/articles/workflow-syntax-for-github-actions
 
-on: push
 name: Ubuntu 16.04
+
+on:
+- push
+- pull_request
+
 jobs:
   ssh:
     name: Connect to github.com
diff --git a/.github/workflows/verify-on-windows.yml b/.github/workflows/verify-on-windows.yml
index c65b2b1..bfd62d5 100644
--- a/.github/workflows/verify-on-windows.yml
+++ b/.github/workflows/verify-on-windows.yml
@@ -1,7 +1,11 @@
 # https://help.github.com/en/articles/workflow-syntax-for-github-actions
 
-on: push
 name: Windows
+
+on:
+- push
+- pull_request
+
 jobs:
   ssh:
     name: Connect to github.com
diff --git a/README.md b/README.md
index 54dc1db..af5a78e 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Useful for SCP, SFTP, and `rsync` over SSH in deployment script.
 
 Add your SSH key to your product secrets by clicking `Settings` - `Secrets` - `Add a new secret` beforehand.
 
-**NOTE:** OPENSSH format (key begins with `-----BEGIN OPENSSH PRIVATE KEY-----`) may not work due to OpenSSH version on VM. Please use PEM format (begins with `-----BEGIN RSA PRIVATE KEY-----`) instead.
+**NOTE:** OPENSSH format (key begins with `-----BEGIN OPENSSH PRIVATE KEY-----`) may not work due to OpenSSH version on VM. Please use PEM format (begins with `-----BEGIN RSA PRIVATE KEY-----`) instead. In order to convert your key inline to PEM format simply use `ssh-keygen -p -m PEM -f ~/.ssh/id_rsa`.
 
 ```yaml
 runs-on: ubuntu-latest
@@ -78,11 +78,11 @@ steps:
 
 ### SSH failed even though key has been installed.
 
-Check belows:
+Check below:
 
 * `Load key "/HOME/.ssh/id_rsa": invalid format`:
     * OPENSSH format (key begins with `-----BEGIN OPENSSH PRIVATE KEY-----`) may not work.
-    * Use PEM format (begins with `-----BEGIN RSA PRIVATE KEY-----`).
+    * Use PEM format (begins with `-----BEGIN RSA PRIVATE KEY-----`). Convert it from OPENSSH format using `ssh-keygen -p -m PEM -f ~/.ssh/id_rsa`
 * `Host key verification failed.`:
     * Set `known_hosts` option correctly (use `ssh-keyscan` command).