diff --git a/README.md b/README.md
index c7192ae..63ccfc2 100644
--- a/README.md
+++ b/README.md
@@ -20,4 +20,5 @@ All patterns [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0
 * "Chaosknoten" based on Chaos Computer Club e.V. logo, originally based on a draft by [Wau Holland](https://www.wauland.de/)
 * "GPN23 characters" partially based on original font design (A, D, E, H, I, N, P, S, T) by GPN23 design team 
 * "Volle Transparenz" based on MRMCD25 logo, inspired by a variation by [tonda](https://chaos.social/@tonda)
-* "Jugend hackt-Alpaca" based on original design by [Rainbow Unicorn](https://rainbow-unicorn.com/), 2013
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+* "Jugend hackt-Alpaca" based on original design by [Rainbow Unicorn](https://rainbow-unicorn.com/), 2013
+* "39c3 Playground" based on original design by Nina Bender & Bernd Volmer
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