diff --git a/CHANGELOG.md b/CHANGELOG.md
index ebec843..d268b70 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Added
+
+- **actor2D:** Make hitbox modifiable.
+
 ### Changed
 
 - **world2D:** Use a list for bodies (hitboxes, etc) and one other for actors
diff --git a/examples/gameplay/plateform/actors/player.lua b/examples/gameplay/plateform/actors/player.lua
index b2c5322..cc892f6 100644
--- a/examples/gameplay/plateform/actors/player.lua
+++ b/examples/gameplay/plateform/actors/player.lua
@@ -15,7 +15,9 @@ function Player:updateStart(dt)
     self.ysp = -280
   end
   if self.keys["down"].isDown then
-    --self.ysp =  120
+    self.mainHitbox:modify(0, 8, 16, 16)
+  else
+    self.mainHitbox:modify(0, 0, 16, 24)
   end
   if self.keys["left"].isDown then
     self.xsp = -120