diff --git a/thermion_dart/lib/src/input/src/input_handler.dart b/thermion_dart/lib/src/input/src/input_handler.dart
index 588e587b..0e4f5968 100644
--- a/thermion_dart/lib/src/input/src/input_handler.dart
+++ b/thermion_dart/lib/src/input/src/input_handler.dart
@@ -13,8 +13,9 @@ enum InputType {
   MMB_UP,
   MMB_HOVER,
   SCALE1,
-  SCALE2,
-  SCALE2_ROTATE,
+  SCALE2, // two fingers pinchin in/out
+  SCALE2_ROTATE, // two fingers rotating in a circle
+  SCALE2_MOVE, // two fingers sliding along a line
   SCROLLWHEEL,
   POINTER_MOVE,
   KEYDOWN_W,