diff --git a/lib/abf_worker/build_lists_publish_task_manager.rb b/lib/abf_worker/build_lists_publish_task_manager.rb
index 73854c766..3cae6d46f 100644
--- a/lib/abf_worker/build_lists_publish_task_manager.rb
+++ b/lib/abf_worker/build_lists_publish_task_manager.rb
@@ -238,6 +238,9 @@ module AbfWorker
       build_lists = build_lists.limit(50)
 
       project_ids = build_lists.pluck(:project_id).uniq
+      # Projects which should be removed:
+      # - /#{save_to_repository_id}\-#{build_for_platform_id}$/ - from repository;
+      # - /^(#{project_ids.join('|')})\-/ - not published in current transaction.
       projects_for_cleanup = @redis.lrange(PROJECTS_FOR_CLEANUP, 0, -1).
         select{ |k| k =~ /#{save_to_repository_id}\-#{build_for_platform_id}$/ && k !~ /^(#{project_ids.join('|')})\-/ }