Buildings that are using barrels to provide improvements to their storage are raising a bubble above them. This is confusing and should not be the case. Bubbles above any building should indicate an alert that we ought to act on, such as rats, dung, etc. The barrels in a building are actually an improvement, and only possible when we buy or produce them to be distributed. Defense buildings don’t give us alerts when they have weapons. They alert us when they don’t. Why should any building alert us to the fact that they have an improvement applied?