Did a search but no luck. It always wonders me and I just want to know if it's correct. Are the app update data size in additional of the original app? or it just replaces the original app data size? For example, FB app is 10MB (just an example) and we have an update today at the App Store and it's showing 15MB. Is it in additional 15MB or just 5MB (15 minus 10)? Can someone please clarify? Thanks.