diff --git a/devops-service/db/mongo/models/stack/stack_base.rb b/devops-service/db/mongo/models/stack/stack_base.rb
index f4b0a9a..9216f6e 100644
--- a/devops-service/db/mongo/models/stack/stack_base.rb
+++ b/devops-service/db/mongo/models/stack/stack_base.rb
@@ -72,6 +72,11 @@ module Devops
         provider_instance.stack_resource(self, resource_id)
       end
 
+      # there is only one way to update stack status right now:
+      #     stack.sync_details!
+      #     mongo.stack_update(stack)
+      # It's because syncing updates @details instance variable, but doesn'not persist it.
+      # Also that's why we need to have "details" key in #to_mongo_hash
       def stack_status
         raise 'override me'
       end