diff --git a/papers/doc/README.md b/papers/doc/README.md
index 11bd2d101..5ed71a100 100644
--- a/papers/doc/README.md
+++ b/papers/doc/README.md
@@ -9,3 +9,16 @@ this documentation is a work in progress! expect several sections to be incomple
 5. [wavetables](5-wave/README.md)
 6. [samples](6-sample/README.md)
 7. [list of systems](7-systems/README.md)
+
+# attribution
+
+writers:
+
+- tildearrow
+- freq-mod
+- nicco1690
+
+other:
+
+- [3-pattern/keyboard.png](3-pattern/keyboard.png) licensed under CC-BY-SA 3.0.
+  - this is a derivative of [KB United States.svg](https://en.wikipedia.org/wiki/File:KB_United_States.svg) by Denelson83 under the same license.