diff --git a/plugins/community_track/lib/community_track_plugin/track_list_block.rb b/plugins/community_track/lib/community_track_plugin/track_list_block.rb
index 477202e..1246e90 100644
--- a/plugins/community_track/lib/community_track_plugin/track_list_block.rb
+++ b/plugins/community_track/lib/community_track_plugin/track_list_block.rb
@@ -61,4 +61,8 @@ class CommunityTrackPlugin::TrackListBlock < Block
     end
   end
 
+  def self.expire_on
+    { :profile => [:article], :environment => [:article] }
+  end
+
 end
diff --git a/plugins/community_track/test/unit/community_track_plugin/track_list_block_test.rb b/plugins/community_track/test/unit/community_track_plugin/track_list_block_test.rb
index ce78dcf..1135564 100644
--- a/plugins/community_track/test/unit/community_track_plugin/track_list_block_test.rb
+++ b/plugins/community_track/test/unit/community_track_plugin/track_list_block_test.rb
@@ -102,4 +102,10 @@ class TrackListBlockTest < ActiveSupport::TestCase
     assert_equal [1, 2], @block.category_ids
   end
 
+  should 'define expiration condition' do
+    condition = CommunityTrackPlugin::TrackListBlock.expire_on
+    assert !condition[:profile].empty?
+    assert !condition[:environment].empty?
+  end
+
 end
--
libgit2 0.21.2