JudasIscariot: We have a changelog feature available in your account for every game that gets an update. If a game has a major update or bonus added to it, we update the changelog.
So what seems to be the problem, if I may ask?
I've never heard such a thing mentioned, nor can I find any mention of it in the FAQ or on other sections of the wrebsite. So the problem is that any information of an update isn't exactly easy to come by.
Is it listed somewhere where a user can actually read the changelog, or are you referring to games that might be flagged as updated in a user's library? If the latter, it isn't usually easy to see what's been updated. If I'm a Windows user, and the game is uipdated with (say) a Linux version, then how am I to know that's all that's changed? If I can see that the game has been updated for the OS I'm using -- in the case of the game i was responding to, it appears to be an update of the installer to provide better compatibility with Windows 10, do I really have to download several GBs (in this instance) and ... what? It's still not going to tell me what's changed.
So: if there is an accessible changelog, I'd appreciate hearing how it can be accessed. If not, it would be a great help if GOG would consider providing such a thing.