diff --git a/src/util/misc.js b/src/util/misc.js
index 79873d3cc83..207ead2741c 100644
--- a/src/util/misc.js
+++ b/src/util/misc.js
@@ -928,10 +928,36 @@
       return Math.max(min, Math.min(value, max));
     },
 
+    /**
+     * Finds the scale for the object source to fit inside the object destination,
+     * keeping aspect ratio intact.
+     * respect the total allowed area for the cache.
+     * @memberOf fabric.util
+     * @param {Object | fabric.Object} source
+     * @param {Number} source.height natural unscaled height of the object
+     * @param {Number} source.width natural unscaled width of the object
+     * @param {Object | fabric.Object} destination
+     * @param {Number} destination.height natural unscaled height of the object
+     * @param {Number} destination.width natural unscaled width of the object
+     * @return {Number} scale factor to apply to source to fit into destination
+     */
     findScaleToFit: function(source, destination) {
       return Math.min(destination.width / source.width, destination.height / source.height);
     },
 
+    /**
+     * Finds the scale for the object source to cover entirely the object destination,
+     * keeping aspect ratio intact.
+     * respect the total allowed area for the cache.
+     * @memberOf fabric.util
+     * @param {Object | fabric.Object} source
+     * @param {Number} source.height natural unscaled height of the object
+     * @param {Number} source.width natural unscaled width of the object
+     * @param {Object | fabric.Object} destination
+     * @param {Number} destination.height natural unscaled height of the object
+     * @param {Number} destination.width natural unscaled width of the object
+     * @return {Number} scale factor to apply to source to cover destination
+     */
     findScaleToCover: function(source, destination) {
       return Math.max(destination.width / source.width, destination.height / source.height);
     },