diff --git a/threejs/three-canvasrenderer.d.ts b/threejs/three-canvasrenderer.d.ts
index cb4e610bc..4a3b84801 100644
--- a/threejs/three-canvasrenderer.d.ts
+++ b/threejs/three-canvasrenderer.d.ts
@@ -23,6 +23,7 @@ declare module THREE {
     export interface CanvasRendererParameters {
         canvas?: HTMLCanvasElement;
         devicePixelRatio?: number;
+        alpha?: boolean;
     }
 
     export class CanvasRenderer implements Renderer {
@@ -55,4 +56,4 @@ declare module THREE {
         clearStencil(): void;
         render(scene: Scene, camera: Camera): void;
     }
-}
\ No newline at end of file
+}