diff --git a/lib/helpers/buildURL.js b/lib/helpers/buildURL.js
index bebacb3..54b3841 100644
--- a/lib/helpers/buildURL.js
+++ b/lib/helpers/buildURL.js
@@ -3,6 +3,14 @@
 var utils = require('../utils');
 var AxiosURLSearchParams = require('../helpers/AxiosURLSearchParams');
 
+/**
+ * It replaces all instances of the characters `:`, `$`, `,`, `+`, `[`, and `]` with their
+ * URI encoded counterparts
+ *
+ * @param {string} val The value to be encoded.
+ *
+ * @returns {string} The encoded value.
+ */
 function encode(val) {
   return encodeURIComponent(val).
     replace(/%3A/gi, ':').
@@ -19,6 +27,7 @@ function encode(val) {
  * @param {string} url The base of the url (e.g., http://www.google.com)
  * @param {object} [params] The params to be appended
  * @param {?object} options
+ *
  * @returns {string} The formatted url
  */
 module.exports = function buildURL(url, params, options) {