diff --git a/cmd/main.go b/cmd/main.go
index dfdc068..3097eb0 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -81,6 +81,11 @@ func main() {
 			Usage:  "Webhook event payload",
 			EnvVar: "PLUGIN_EVENT_PAYLOAD",
 		},
+		cli.StringFlag{
+			Name:   "actor",
+			Usage:  "User that triggered the event",
+			EnvVar: "PLUGIN_ACTOR",
+		},
 
 		// daemon flags
 		cli.StringFlag{
@@ -179,6 +184,7 @@ func run(c *cli.Context) error {
 			Verbose:      c.Bool("action-verbose"),
 			Image:        c.String("action-image"),
 			EventPayload: c.String("event-payload"),
+			Actor:        c.String("actor"),
 		},
 		Daemon: daemon.Daemon{
 			Registry:      c.String("docker.registry"),
diff --git a/plugin.go b/plugin.go
index f5f405f..69f3a0f 100644
--- a/plugin.go
+++ b/plugin.go
@@ -30,6 +30,7 @@ type (
 		Env          map[string]string
 		Image        string
 		EventPayload string // Webhook event payload
+		Actor        string
 		Verbose      bool
 	}
 
@@ -67,6 +68,12 @@ func (p Plugin) Exec() error {
 		"--detect-event",
 	}
 
+	// optional arguments
+	if p.Action.Actor != "" {
+		cmdArgs = append(cmdArgs, "--actor")
+		cmdArgs = append(cmdArgs, p.Action.Actor)
+	}
+
 	if p.Action.EventPayload != "" {
 		if err := ioutil.WriteFile(eventPayloadFile, []byte(p.Action.EventPayload), 0644); err != nil {
 			return errors.Wrap(err, "failed to write event payload to file")