diff --git a/docs/camera.rst b/docs/camera.rst
index b3d355d..dc14d7e 100644
--- a/docs/camera.rst
+++ b/docs/camera.rst
@@ -17,7 +17,7 @@ worry about that.
     end
     
     function love.update(dt)
-        local dx,dy = player.x - cam.x, player.y - cam.y
+        local dx,dy = player.x - camera.x, player.y - camera.y
         camera:move(dx/2, dy/2)
     end