diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 0449611..388a918 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -8,6 +8,8 @@ require 'byebug'
 require 'crono'
 require 'generators/crono/install/templates/migrations/create_crono_jobs.rb'
 
+# setting default time zone
+# In Rails project, Time.zone_default equals "UTC"
 Time.zone_default = Time.find_zone("UTC")
 
 ActiveRecord::Base.establish_connection(