diff --git a/packages/modeling/src/geometries/poly3/type.d.ts b/packages/modeling/src/geometries/poly3/type.d.ts
index 1aa660296..861353f3f 100644
--- a/packages/modeling/src/geometries/poly3/type.d.ts
+++ b/packages/modeling/src/geometries/poly3/type.d.ts
@@ -1,3 +1,4 @@
+import Plane from '../../maths/plane/type'
 import Vec3 from '../../maths/vec3/type'
 import { Color } from '../types'
 
@@ -6,4 +7,5 @@ export default Poly3
 declare interface Poly3 {
   vertices: Array<Vec3>
   color?: Color
+  plane?: Plane
 }