Adding JSDoc comments

lib/errors.js

@@ -25,6 +25,8 @@ util.inherits(error.BaseError, Error);
 /**
  * Validation Error
  *
+ * @param {string} message Error message
+ * @param {Array} [errors] Array of ValidationErrorItem objects describing the validation errors
  * @constructor
  */
 error.ValidationError = function(message, errors) {
@@ -64,4 +66,4 @@ error.ValidationErrorItem = function(message, type, path, value) {
   this.type = type || null;
   this.path = path || null;
   this.value = value || null;
-};
\ No newline at end of file
+};