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 Comparison, context, similarities to Energia 

This has very striking similarities to the Energia system, the concept of using a space shuttle system's hardware for launching other things isn't unique. There are obvious differences too, like stretching out everything and making it taller, whereas the Energia just uses multiple generic strap-ons, and the main engines were always on the bottom of the big tank for the Buran, so in the sls they have to move them across. 

I'm surprised it's not in the see also section, or used to provide some context for the article's subject. Of course I have no idea if anyone notable has commented on it, but for these kinds of inclusions, nothing is required.   ☏ "