diff --git a/gamecore/modules/world/actors/actor2D.lua b/gamecore/modules/world/actors/actor2D.lua
index 1838669..a201ea4 100644
--- a/gamecore/modules/world/actors/actor2D.lua
+++ b/gamecore/modules/world/actors/actor2D.lua
@@ -98,19 +98,6 @@ function Actor2D:changeSpeedToCollisionNormal(nx, ny)
   self.xsp, self.ysp = xsp, ysp
 end
 
-function Actor2D:checkGround()
-  local dx, dy = self.x, self.y + utils.math.sign(self.grav)
-  local newx, newy, cols, colNumber = self:checkCollision(dx, dy)
-
-  for i, col in ipairs(cols) do
-    if (col.type == "touch") or (col.type == "bounce") or (col.type == "slide") then
-      if not (self.grav == 0) then
-        if col.normal.y ~= utils.math.sign(self.grav) then self.onGround = true end
-      end
-    end
-  end
-end
-
 function Actor2D:move(dx, dy)
   local cols, colNumber = {}, 0
   if (self.isDestroyed == false) then
@@ -138,6 +125,9 @@ function Actor2D:initGravity()
   self.onGround = false
 end
 
+-- GRAVITY SYSTEM FUNCTIONS
+-- All functions related to gravity
+
 function Actor2D:setGravity(grav)
   -- It's basically now a function with two roles at once :
   -- - activate the gravity
@@ -154,6 +144,19 @@ function Actor2D:applyGravity(dt)
   end
 end
 
+function Actor2D:checkGround()
+  local dx, dy = self.x, self.y + utils.math.sign(self.grav)
+  local newx, newy, cols, colNumber = self:checkCollision(dx, dy)
+
+  for i, col in ipairs(cols) do
+    if (col.type == "touch") or (col.type == "bounce") or (col.type == "slide") then
+      if not (self.grav == 0) then
+        if col.normal.y ~= utils.math.sign(self.grav) then self.onGround = true end
+      end
+    end
+  end
+end
+
 -- HITBOXES FUNCTIONS
 -- Functions related to actor hitboxes