diff --git a/guacamole-common-js/src/main/webapp/modules/Display.js b/guacamole-common-js/src/main/webapp/modules/Display.js
index 853c69acc..41f04c7b3 100644
--- a/guacamole-common-js/src/main/webapp/modules/Display.js
+++ b/guacamole-common-js/src/main/webapp/modules/Display.js
@@ -512,11 +512,17 @@ Guacamole.Display = function() {
      * Draws the specified image at the given coordinates. The image specified
      * must already be loaded.
      * 
-     * @param {Guacamole.Layer} layer The layer to draw upon.
-     * @param {Number} x The destination X coordinate.
-     * @param {Number} y The destination Y coordinate.
-     * @param {Image} image The image to draw. Note that this is an Image
-     *                      object - not a URL.
+     * @param {Guacamole.Layer} layer
+     *     The layer to draw upon.
+     *
+     * @param {Number} x
+     *     The destination X coordinate.
+     *
+     * @param {Number} y 
+     *     The destination Y coordinate.
+     *
+     * @param {CanvasImageSource} image
+     *     The image to draw. Note that this not a URL.
      */
     this.drawImage = function(layer, x, y, image) {
         scheduleTask(function __display_drawImage() {
diff --git a/guacamole-common-js/src/main/webapp/modules/Layer.js b/guacamole-common-js/src/main/webapp/modules/Layer.js
index 5384d2c74..cd87d8d1d 100644
--- a/guacamole-common-js/src/main/webapp/modules/Layer.js
+++ b/guacamole-common-js/src/main/webapp/modules/Layer.js
@@ -319,10 +319,14 @@ Guacamole.Layer = function(width, height) {
      * Draws the specified image at the given coordinates. The image specified
      * must already be loaded.
      * 
-     * @param {Number} x The destination X coordinate.
-     * @param {Number} y The destination Y coordinate.
-     * @param {Image} image The image to draw. Note that this is an Image
-     *                      object - not a URL.
+     * @param {Number} x
+     *     The destination X coordinate.
+     *
+     * @param {Number} y
+     *     The destination Y coordinate.
+     *
+     * @param {CanvasImageSource} image
+     *     The image to draw. Note that this is not a URL.
      */
     this.drawImage = function(x, y, image) {
         if (layer.autosize) fitRect(x, y, image.width, image.height);