diff --git a/lighthouse-protocol/src/input/input_event.rs b/lighthouse-protocol/src/input/input_event.rs
index fa2d7f2..0fe5fd8 100644
--- a/lighthouse-protocol/src/input/input_event.rs
+++ b/lighthouse-protocol/src/input/input_event.rs
@@ -53,7 +53,7 @@ impl InputEvent {
 mod tests {
     use serde_json::json;
 
-    use crate::{EventSource, GamepadAxis2DEvent, GamepadAxisEvent, GamepadButtonEvent, GamepadControlEvent, GamepadEvent, InputEvent, KeyEvent, KeyModifiers, MouseButton, MouseEvent, Pos, Vec2};
+    use crate::{Delta, EventSource, GamepadAxis2DEvent, GamepadAxisEvent, GamepadButtonEvent, GamepadControlEvent, GamepadEvent, InputEvent, KeyEvent, KeyModifiers, MouseButton, MouseEvent, Pos, Vec2};
 
     #[test]
     fn key_event() {
@@ -88,15 +88,24 @@ mod tests {
                 "type": "mouse",
                 "source": 1,
                 "button": "left",
+                "down": true,
+                "pointerLocked": false,
                 "pos": {
                     "x": 2,
                     "y": 4,
                 },
+                "movement": {
+                    "x": 6,
+                    "y": -3,
+                },
             })).unwrap(),
             InputEvent::Mouse(MouseEvent {
                 source: EventSource::Int(1),
                 button: MouseButton::Left,
+                down: true,
+                pointer_locked: false,
                 pos: Pos::new(2.0, 4.0),
+                movement: Delta::new(6.0, -3.0),
             })
         );
     }
diff --git a/lighthouse-protocol/src/input/mouse_event.rs b/lighthouse-protocol/src/input/mouse_event.rs
index d09ece0..9d61462 100644
--- a/lighthouse-protocol/src/input/mouse_event.rs
+++ b/lighthouse-protocol/src/input/mouse_event.rs
@@ -1,6 +1,6 @@
 use serde::{Deserialize, Serialize};
 
-use crate::Pos;
+use crate::{Delta, Pos};
 
 use super::{EventSource, MouseButton};
 
@@ -10,8 +10,14 @@ use super::{EventSource, MouseButton};
 pub struct MouseEvent {
     /// The client identifier.
     pub source: EventSource,
+    /// Whether the button was pressed.
+    pub down: bool,
+    /// Whether the mouse pointer was locked (e.g. to the frontend's canvas)
+    pub pointer_locked: bool,
     /// The mouse button.
     pub button: MouseButton,
-    /// The mouse position.
+    /// The mouse position on the lighthouse grid.
     pub pos: Pos<f64>,
+    /// The mouse movement on the lighthouse grid.
+    pub movement: Delta<f64>,
 }