diff --git a/CHANGELOG.md b/CHANGELOG.md
index fbded10..45859be 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [0.18.2] - 2020-03-06
+### Add
+- Added function `removeDoubleSpace` to get rid of the spaces over one in `StringUtils`
+
 ## [0.18.1] - 2020-02-21
 ### Fixed
 - Fixed property `client` to protected in `RedisCache`
diff --git a/lib/Util/StringUtils.php b/lib/Util/StringUtils.php
index 31fb6c1..8ce0310 100644
--- a/lib/Util/StringUtils.php
+++ b/lib/Util/StringUtils.php
@@ -112,6 +112,7 @@ private static function normalizeSpace($str, $is_single_line = false)
      * 두개 이상의 띄어쓰기(0x20)를 한개로 치환합니다.
      *
      * @param string $str 정규화된 문자열
+     * @return string
      *
      * @see StringUtils::normalizeString()
      */