diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index 5082c508..8258eada 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -98,3 +98,6 @@
 
 - Nicolas Poilvert
   Shape views: ``util.shape.view_as_windows`` and ``util.shape.view_as_blocks``
+
+- Johannes Schönberger
+  Polygon, circle and ellipse drawing functions