diff --git a/docs/content/en/docs-dev/user-guide/command-line-tool.md b/docs/content/en/docs-dev/user-guide/command-line-tool.md
index e0c0de5746..447681cdbd 100644
--- a/docs/content/en/docs-dev/user-guide/command-line-tool.md
+++ b/docs/content/en/docs-dev/user-guide/command-line-tool.md
@@ -193,7 +193,7 @@ Usage:
 
 Flags:
       --app-dir string            The relative path from the root of repository to the application directory.
-      --app-kind string           The kind of application. (KUBERNETES|TERRAFORM|LAMBDA|CLOUDRUN)
+      --app-kind string           The kind of application. (KUBERNETES|TERRAFORM|LAMBDA|CLOUDRUN|ECS)
       --app-name string           The application name.
       --platform-provider string  The platform provider name. One of the registered providers in the piped configuration. The previous name of this field is cloud-provider.
       --config-file-name string   The configuration file name. (default "app.pipecd.yaml")
diff --git a/pkg/app/pipectl/cmd/application/add.go b/pkg/app/pipectl/cmd/application/add.go
index 26e25badd1..6db5c2c4b0 100644
--- a/pkg/app/pipectl/cmd/application/add.go
+++ b/pkg/app/pipectl/cmd/application/add.go
@@ -51,7 +51,7 @@ func newAddCommand(root *command) *cobra.Command {
 	}
 
 	cmd.Flags().StringVar(&c.appName, "app-name", c.appName, "The application name.")
-	cmd.Flags().StringVar(&c.appKind, "app-kind", c.appKind, "The kind of application. (KUBERNETES|TERRAFORM|LAMBDA|CLOUDRUN)")
+	cmd.Flags().StringVar(&c.appKind, "app-kind", c.appKind, "The kind of application. (KUBERNETES|TERRAFORM|LAMBDA|CLOUDRUN|ECS)")
 	cmd.Flags().StringVar(&c.pipedID, "piped-id", c.pipedID, "The ID of piped that should handle this application.")
 	cmd.Flags().StringVar(&c.platformProvider, "platform-provider", c.platformProvider, "The platform provider name. One of the registered providers in the piped configuration. Previous name of this field is cloud-provider.")