diff --git a/CHANGELOG.md b/CHANGELOG.md
index 68fe20e..2b62210 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,10 +1,14 @@
-#Change Log
+# Change Log
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 This CHANGELOG follows the format listed at [Keep A Changelog](http://keepachangelog.com/)
 
 ## [Unreleased]
 
+## [1.5.0] - 2017-07-26
+### Added
+- check-es-query-average.rb: check of average result by field (@ilavender)
+
 ## [1.4.1] - 2017-07-13
 ### Fixed
 - use timestamp_field from config for sorting in Kibana (@osgida)
@@ -164,7 +168,8 @@ This CHANGELOG follows the format listed at [Keep A Changelog](http://keepachang
 ### Added
 - initial release
 
-[Unreleased]: https://github.com/sensu-plugins/sensu-plugins-elasticsearch/compare/1.4.1...HEAD
+[Unreleased]: https://github.com/sensu-plugins/sensu-plugins-elasticsearch/compare/1.5.0...HEAD
+[1.5.0]: https://github.com/sensu-plugins/sensu-plugins-elasticsearch/compare/1.4.1...1.5.0
 [1.4.1]: https://github.com/sensu-plugins/sensu-plugins-elasticsearch/compare/1.4.0...1.4.1
 [1.4.0]: https://github.com/sensu-plugins/sensu-plugins-elasticsearch/compare/1.3.1...1.4.0
 [1.3.1]: https://github.com/sensu-plugins/sensu-plugins-elasticsearch/compare/1.3.0...1.3.1
diff --git a/Rakefile b/Rakefile
index 66c6adc..51cb458 100644
--- a/Rakefile
+++ b/Rakefile
@@ -5,6 +5,7 @@ require 'rspec/core/rake_task'
 require 'rubocop/rake_task'
 require 'yard'
 require 'yard/rake/yardoc_task'
+require 'English'
 
 YARD::Rake::YardocTask.new do |t|
   OTHER_PATHS = %w().freeze