diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
deleted file mode 100644
index f5d7881..0000000
--- a/CONTRIBUTORS.md
+++ /dev/null
@@ -1,6 +0,0 @@
-# Contributors
-
-- Hartmut Seichter (dev lead)
-- Robin Rottstädt (image loader)
-- Tim Gösselmann (Win32 fixes)
-- Hannes Brothuhn (Flappy Bird clone)
diff --git a/docs/README.md b/docs/README.md
index b373f58..64ecc08 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -4,7 +4,6 @@ Here some ideas for improving this tiny engine:
 
 ## Rendering
 - [ ] replace the OpenGL renderer with a Vulkan backend
-- [ ] add sprite atlas support (test case Kenny flappy bird)
 - [ ] add animatable sprites (access to UV mapping and tiling)
 - [ ] add a SDF based renderer (parametric tiles and font rendering)
 
@@ -16,11 +15,11 @@ Here some ideas for improving this tiny engine:
 ## System Level
 
 - [ ] add a `Asset` handler to load cache and manage assets
-- [ ] introspection of file system if we load asset
+- [ ] introspection of file system if we load assset
 
 ## Design
 
-- [ ] replace some of the 'unknown source' assets
+- [ ] replace some of the 'unkown source' assets
 
 ## Build / Dev Support
 - [ ] add a test rig either with Snitch or Catch2
@@ -28,11 +27,10 @@ Here some ideas for improving this tiny engine:
 - [ ] add CPU and GPU benchmarks to address various issues
 
 
-# Performance
+# Issues
 
-For such a small engine, this should never happen:
 
-```bash
+```sh
  Performance counter stats for 'bin/paradiso_pong':
 
             555,35 msec task-clock:u                     #    0,042 CPUs utilized
diff --git a/examples/quickwings/quickwings.cpp b/examples/quickwings/quickwings.cpp
index dd51112..2259737 100644
--- a/examples/quickwings/quickwings.cpp
+++ b/examples/quickwings/quickwings.cpp
@@ -1,7 +1,8 @@
 /**
  * paradiso - Paradigmen der Softwareentwicklung
  *
- * (c) Copyright 2023-2025 Hartmut Seichter and Contributors
+ * (c) Copyright 2023-2025 Hartmut Seichter and Contributors, Robin Rottstädt,
+ * brxxh (Hannes Brothuhn)
  *
  */
 
@@ -12,16 +13,12 @@
 #include <paradiso/renderer.hpp>
 #include <paradiso/shader.hpp>
 #include <paradiso/sprite.hpp>
-#include <paradiso/utils.hpp>
 #include <paradiso/vector.hpp>
 #include <paradiso/window.hpp>
 
 #include <chrono>
 #include <thread>
 
-// TODO remove all hard coded 'magic' values!
-
-// TODO - remove global variables
 const int frame_rate = 60;
 bool game_over = false;
 float risky_pos_x;
@@ -41,7 +38,6 @@ struct Background {
 
     paradiso::Renderer renderer{};
 
-    // TODO no constructors in rule of zero
     Background() {
         auto backgroundImage =
             paradiso::BitmapIO::get().load("background-day.png");
@@ -95,8 +91,6 @@ struct Pipe {
 
     bool pos_reset = false;
 
-    // TODO no constructors in rule of zero
-
     Pipe() {
         auto pipe_image = paradiso::BitmapIO::get().load("pipe-green.png");
 
@@ -121,8 +115,6 @@ struct Pipe {
 
     void update() {
 
-        // TODO improve state handling
-
         if (game_over == true) {
             paused = true;
         }
@@ -182,7 +174,6 @@ struct Grass {
     paradiso::Renderer renderer1{};
     paradiso::Renderer renderer2{};
 
-    // TODO no constructors in rule of zero
     Grass() {
         auto grassImage = paradiso::BitmapIO::get().load("base.png");
         grassLeft = paradiso::Sprite{
@@ -253,7 +244,6 @@ struct QuickWings {
 
     int collision_counter = 0;
 
-    // TODO no constructors in rule of zero
     QuickWings() {
         float scaleh = 0.08f;
         float scalew = 0.158f;