diff --git a/README.md b/README.md
index 5907d72..a1a19cf 100644
--- a/README.md
+++ b/README.md
@@ -234,9 +234,15 @@ Currently, supported CI are here:
 - Travis CI
 - AWS CodeBuild
 
+If you want to run tfnotify locally and use GitHub as notifier, please set `--pr` flag with `--ci=local` like the following:
+
+```console
+$ terraform plan | ./tfnotify --ci "local" --pr "2" plan
+```
+
 ### Private Repository Considerations
-GitHub private repositories require the `repo` and `write:discussion` permissions.
 
+GitHub private repositories require the `repo` and `write:discussion` permissions.
 
 ## Committers
 
diff --git a/config/config.go b/config/config.go
index 419a4b1..1d471d1 100644
--- a/config/config.go
+++ b/config/config.go
@@ -96,6 +96,8 @@ func (cfg *Config) Validation() error {
 	switch strings.ToLower(cfg.CI) {
 	case "":
 		return errors.New("ci: need to be set")
+	case "local":
+		// ok pattern
 	case "circleci", "circle-ci":
 		// ok pattern
 	case "travis", "travisci", "travis-ci":
diff --git a/main.go b/main.go
index eb9e8c2..9ab46cf 100644
--- a/main.go
+++ b/main.go
@@ -38,6 +38,14 @@ func (t *tfnotify) Run() error {
 	var ci CI
 	var err error
 	switch ciname {
+	case "local":
+		ci = CI{
+			URL: "",
+			PR: PullRequest{
+				Number:   t.context.GlobalInt("pr"),
+				Revision: "",
+			},
+		}
 	case "circleci", "circle-ci":
 		ci, err = circleci()
 		if err != nil {
@@ -134,6 +142,7 @@ func main() {
 	app.Usage = description
 	app.Version = version
 	app.Flags = []cli.Flag{
+		cli.IntFlag{Name: "pr", Usage: "Pull request number. this is useful for running locally. this should be given with --ci=local"},
 		cli.StringFlag{Name: "ci", Usage: "name of CI to run tfnotify"},
 		cli.StringFlag{Name: "config", Usage: "config path"},
 		cli.StringFlag{Name: "notifier", Usage: "notification destination"},