diff --git a/js/prototype.js b/js/extensions/number.extension.js
similarity index 82%
rename from js/prototype.js
rename to js/extensions/number.extension.js
index d14c281ce8965d2ffb8048caaa9cfe0b6c5e8de9..0e32bb8595ea16d40ec06091506ee072e281a015 100644
--- a/js/prototype.js
+++ b/js/extensions/number.extension.js
@@ -4,6 +4,6 @@
  * @param {number} max The maximum value.
  * @param {boolean} inclusive Whether or not to include the minimum and maximum values.
  */
-Number.prototype.between = function(min, max, inclusive = false) {
+ Number.prototype.between = function(min, max, inclusive = false) {
 	return inclusive ? this >= min && this <= max : this > min && this < max;
 };