diff --git a/src/body/Body.js b/src/body/Body.js
index 0e7bf68..f0eef24 100644
--- a/src/body/Body.js
+++ b/src/body/Body.js
@@ -998,6 +998,14 @@ var Axes = require('../geometry/Axes');
      * @default true
      */
 
+    /**
+     * Sets the opacity to use when rendering.
+     *
+     * @property render.opacity
+     * @type number
+     * @default 1
+    */
+
     /**
      * An `Object` that defines the sprite properties to use when rendering, if any.
      *