diff --git a/mobile/touches_android.go b/mobile/touches_android.go
index e1a13f88b..150472f94 100644
--- a/mobile/touches_android.go
+++ b/mobile/touches_android.go
@@ -26,5 +26,5 @@ func updateTouchesOnAndroid(action int, id int, x, y int) {
 }
 
 func updateTouchesOnIOSImpl(phase int, ptr int64, x, y int) {
-	panic("not reach")
+	panic("mobile: updateTouchesOnIOSImpl must not be called on Android")
 }
diff --git a/mobile/touches_ios.go b/mobile/touches_ios.go
index 7472f261f..3f0afaa3a 100644
--- a/mobile/touches_ios.go
+++ b/mobile/touches_ios.go
@@ -40,7 +40,7 @@ func getIDFromPtr(ptr int64) int {
 }
 
 func updateTouchesOnAndroid(action int, id int, x, y int) {
-	panic("not reach")
+	panic("mobile: updateTouchesOnAndroid must not be called on iOS")
 }
 
 func updateTouchesOnIOSImpl(phase int, ptr int64, x, y int) {
@@ -55,6 +55,6 @@ func updateTouchesOnIOSImpl(phase int, ptr int64, x, y int) {
 		delete(touches, id)
 		updateTouches()
 	default:
-		panic("not reach")
+		panic("not reached")
 	}
 }