diff --git a/inputcontrol/controller_portal.go b/inputcontrol/controller_portal.go
index b5db467..05ffb1d 100644
--- a/inputcontrol/controller_portal.go
+++ b/inputcontrol/controller_portal.go
@@ -245,7 +245,7 @@ func (p *portalController) PointerButton(button PointerButton, press bool) error
 	case PointerButtonRight:
 		btn = btnRight
 	default:
-		return errors.New("unsupported pointer button")
+		return fmt.Errorf("unsupported pointer button: %#v", button)
 	}
 	state := btnReleased
 	if press {
diff --git a/inputcontrol/controller_windows.go b/inputcontrol/controller_windows.go
index 6184187..8cb73a7 100644
--- a/inputcontrol/controller_windows.go
+++ b/inputcontrol/controller_windows.go
@@ -22,7 +22,7 @@
 package inputcontrol
 
 import (
-	"errors"
+	"fmt"
 	"syscall"
 	"unsafe"
 )
@@ -173,7 +173,7 @@ func (p *windowsController) KeyboardKey(key Key) error {
 	case KeyMediaPlayPause:
 		input.wVk = vkMediaPlayPause
 	default:
-		return errors.New("key not mapped to virtual-key code")
+		return fmt.Errorf("key not mapped to virtual-key code: %#v", key)
 	}
 	inputs := [...]keybdInput{input, input}
 	inputs[1].dwFlags |= keyeventfKeyup
@@ -195,7 +195,7 @@ func (p *windowsController) PointerButton(button PointerButton, press bool) erro
 	} else if button == PointerButtonRight {
 		input.dwFlags = mouseeventfRightup
 	} else {
-		return errors.New("unsupported pointer button")
+		return fmt.Errorf("unsupported pointer button: %#v", button)
 	}
 	if r, _, err := sendInputProc.Call(1, uintptr(unsafe.Pointer(&input)),
 		unsafe.Sizeof(input)); int(r) != 1 {
diff --git a/inputcontrol/controller_x11.go b/inputcontrol/controller_x11.go
index 87c29bd..bc1ec6b 100644
--- a/inputcontrol/controller_x11.go
+++ b/inputcontrol/controller_x11.go
@@ -33,6 +33,7 @@ package inputcontrol
 import "C"
 import (
 	"errors"
+	"fmt"
 	"strings"
 	"sync"
 	"time"
@@ -309,7 +310,7 @@ func (p *x11Controller) PointerButton(button PointerButton, press bool) error {
 	case PointerButtonMiddle:
 		return p.sendButton(2, press)
 	default:
-		return errors.New("unsupported pointer button")
+		return fmt.Errorf("unsupported pointer button: %#v", button)
 	}
 }
 
diff --git a/inputcontrol/keysyms.go b/inputcontrol/keysyms.go
index 2af1bb8..de183a1 100644
--- a/inputcontrol/keysyms.go
+++ b/inputcontrol/keysyms.go
@@ -23,7 +23,7 @@ package inputcontrol
 
 //go:generate go run keysyms.generator.go
 
-import "errors"
+import "fmt"
 
 type Keysym int32
 
@@ -57,8 +57,8 @@ func RuneToKeysym(runeValue rune) (Keysym, error) {
 	keysym, found := keysymsMap[runeValue]
 	if !found {
 		if runeValue < 0x100 || runeValue > 0x10ffff {
-			return 0, errors.New("rune not mappend to keysym and " +
-				"out of range for direct unicode mapping")
+			return 0, fmt.Errorf("rune not mappend to keysym and "+
+				"out of range for direct unicode mapping: %q", runeValue)
 		}
 		keysym = Keysym(0x01000000 + runeValue)
 	}
@@ -104,6 +104,6 @@ func KeyToKeysym(key Key) (Keysym, error) {
 	case KeyBrowserForward:
 		return xf86xkForward, nil
 	default:
-		return 0, errors.New("key not mapped to keysym")
+		return 0, fmt.Errorf("key not mapped to keysym: %#v", key)
 	}
 }