diff --git a/packages/core/src/renderTexture/RenderTextureSystem.js b/packages/core/src/renderTexture/RenderTextureSystem.js
index 7e29532..57c2fcc 100644
--- a/packages/core/src/renderTexture/RenderTextureSystem.js
+++ b/packages/core/src/renderTexture/RenderTextureSystem.js
@@ -61,9 +61,9 @@
 
     /**
      * Bind the current render texture
-     * @param {PIXI.RenderTexture} renderTexture
-     * @param {PIXI.Rectangle} sourceFrame
-     * @param {PIXI.Rectangle} destinationFrame
+     * @param {PIXI.RenderTexture} [renderTexture] - RenderTexture to bind, by default its `null`, the screen
+     * @param {PIXI.Rectangle} [sourceFrame] - part of screen that is mapped to the renderTexture
+     * @param {PIXI.Rectangle} [destinationFrame] - part of renderTexture, by default it has the same size as sourceFrame
      */
     bind(renderTexture = null, sourceFrame, destinationFrame)
     {