diff --git a/src/rendering/twn_gl_any_rendering.c b/src/rendering/twn_gl_any_rendering.c
index 63071f9..a7795c9 100644
--- a/src/rendering/twn_gl_any_rendering.c
+++ b/src/rendering/twn_gl_any_rendering.c
@@ -66,6 +66,7 @@ void bind_quad_element_buffer(void) {
 
 
 void clear_draw_buffer(void) {
+    /* TODO: we can optimize a rectangle drawn over whole window to a clear color call*/
     glClearColor((1.0f / 255) * 230,
                  (1.0f / 255) * 230,
                  (1.0f / 255) * 230, 1);