diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
new file mode 100644
index 0000000..f5d7881
--- /dev/null
+++ b/CONTRIBUTORS.md
@@ -0,0 +1,6 @@
+# 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 64ecc08..b373f58 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -4,6 +4,7 @@ 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)
 
@@ -15,11 +16,11 @@ 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 assset
+- [ ] introspection of file system if we load asset
 
 ## Design
 
-- [ ] replace some of the 'unkown source' assets
+- [ ] replace some of the 'unknown source' assets
 
 ## Build / Dev Support
 - [ ] add a test rig either with Snitch or Catch2
@@ -27,10 +28,11 @@ Here some ideas for improving this tiny engine:
 - [ ] add CPU and GPU benchmarks to address various issues
 
 
-# Issues
+# Performance
 
+For such a small engine, this should never happen:
 
-```sh
+```bash
  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 2259737..17730a7 100644
--- a/examples/quickwings/quickwings.cpp
+++ b/examples/quickwings/quickwings.cpp
@@ -1,8 +1,7 @@
 /**
  * paradiso - Paradigmen der Softwareentwicklung
  *
- * (c) Copyright 2023-2025 Hartmut Seichter and Contributors, Robin Rottstädt,
- * brxxh (Hannes Brothuhn)
+ * (c) Copyright 2023-2025 Hartmut Seichter and Contributors
  *
  */
 
@@ -13,6 +12,7 @@
 #include <paradiso/renderer.hpp>
 #include <paradiso/shader.hpp>
 #include <paradiso/sprite.hpp>
+#include <paradiso/utils.hpp>
 #include <paradiso/vector.hpp>
 #include <paradiso/window.hpp>