diff --git a/examples/keyboard/main.go b/examples/keyboard/main.go
index 9a4469cb4..db1d043e4 100644
--- a/examples/keyboard/main.go
+++ b/examples/keyboard/main.go
@@ -21,8 +21,10 @@ import (
 	"image"
 	_ "image/png"
 	"log"
+	"strings"
 
 	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/ebitenutil"
 	"github.com/hajimehoshi/ebiten/examples/keyboard/keyboard"
 	rkeyabord "github.com/hajimehoshi/ebiten/examples/resources/images/keyboard"
 )
@@ -44,7 +46,6 @@ func init() {
 }
 
 func update(screen *ebiten.Image) error {
-	// Collect pressed keys' names.
 	pressed := []ebiten.Key{}
 	for k := ebiten.Key(0); k <= ebiten.KeyMax; k++ {
 		if ebiten.IsKeyPressed(k) {
@@ -81,6 +82,12 @@ func update(screen *ebiten.Image) error {
 		screen.DrawImage(keyboardImage, op)
 	}
 
+	keyStrs := []string{}
+	for _, p := range pressed {
+		keyStrs = append(keyStrs, p.String())
+	}
+	ebitenutil.DebugPrint(screen, strings.Join(keyStrs, ", "))
+
 	return nil
 }
 
diff --git a/input.go b/input.go
index 0ff5b0711..e72b4a432 100644
--- a/input.go
+++ b/input.go
@@ -35,6 +35,9 @@ func InputChars() []rune {
 
 // IsKeyPressed returns a boolean indicating whether key is pressed.
 //
+// Known issue: On Edge browser, KeyKPEnter and KeyKPEqual don't work well.
+// These keys are recognized as KeyEnter and KeyEqual.
+//
 // This function is concurrent-safe.
 func IsKeyPressed(key Key) bool {
 	return input.Get().IsKeyPressed(input.Key(key))
diff --git a/keys.go b/keys.go
index aef42eceb..703bf9e0e 100644
--- a/keys.go
+++ b/keys.go
@@ -28,8 +28,6 @@ import (
 type Key int
 
 // Keys.
-//
-// Known issue: KeyKPEnter and KeyKPEqual don't work on Edge browsers.
 const (
 	Key0            Key = Key(input.Key0)
 	Key1            Key = Key(input.Key1)