diff --git a/cmd_alpha.go b/cmd_alpha.go
index f22c363..731bb87 100644
--- a/cmd_alpha.go
+++ b/cmd_alpha.go
@@ -1,6 +1,10 @@
 package main
 
-import "errors"
+import (
+	"errors"
+
+	"github.com/shu-go/rog"
+)
 
 type alphaCmd struct {
 }
@@ -11,6 +15,9 @@ func (c alphaCmd) Run(args []string, g globalCmd) error {
 	}
 
 	alpha := toInt(args[0], 255)
+	if g.Debug {
+		rog.Printf("alpha = %v -> %v", args[0], alpha)
+	}
 
 	style, _, _ := getWindowLong.Call(uintptr(g.targetHandle), GWL_EXSTYLE)
 	setWindowLong.Call(uintptr(g.targetHandle), GWL_EXSTYLE, style|WS_EX_LAYERED)