diff --git a/Entities.md b/Entities.md
index 9d4e2a3..7a63f4d 100644
--- a/Entities.md
+++ b/Entities.md
@@ -15,7 +15,7 @@ A list of some entities we might want dyna3 to support
 - Polygons
 - Spherical polygons
 - Polyhedra
-- Cylinders
+- Cylinders/prisms
 - Cones
 - Conic sections?
 - Quadric surfaces?