diff --git a/app/models/rate.rb b/app/models/rate.rb
index 9978e22..36cff18 100644
--- a/app/models/rate.rb
+++ b/app/models/rate.rb
@@ -80,6 +80,7 @@ class Rate < ActiveRecord::Base
         end
       end
     end
+    store_cache_timestamp('last_caching_run', Time.now.to_s)
   end
   
   private
@@ -121,6 +122,10 @@ class Rate < ActiveRecord::Base
     end
   end
 
+  def self.store_cache_timestamp(cache_name, timestamp)
+    Setting.plugin_redmine_rate = Setting.plugin_redmine_rate.merge({cache_name => timestamp})
+  end
+
   if Rails.env.test?
     public
     generator_for :date_in_effect => Date.today
diff --git a/init.rb b/init.rb
index e5d6665..c18393b 100644
--- a/init.rb
+++ b/init.rb
@@ -29,7 +29,12 @@ Redmine::Plugin.register :redmine_rate do
   version '0.1.0'
 
   requires_redmine :version_or_higher => '0.8.0'
-  
+
+  # These settings are set automatically when caching
+  settings(:default => {
+             'last_caching_run' => nil
+           })
+
   permission :view_rate, { }
 end
 
diff --git a/test/unit/rate_test.rb b/test/unit/rate_test.rb
index e2267e4..e492771 100644
--- a/test/unit/rate_test.rb
+++ b/test/unit/rate_test.rb
@@ -292,6 +292,13 @@ class RateTest < ActiveSupport::TestCase
 
     end
     
-    should "timestamp a successful run"
+    should "timestamp a successful run" do
+      assert_equal nil, Setting.plugin_redmine_rate['last_caching_run']
+
+      Rate.update_all_time_entries_with_missing_cost
+
+      assert Setting.plugin_redmine_rate['last_caching_run'], "Last run not timestamped"
+      assert Time.parse(Setting.plugin_redmine_rate['last_caching_run']), "Last run timestamp not parseable"
+    end
   end
 end