How to write/format a digression in conference/thesis papers I am currently writing a paper and in one of the sections it would be appropriate to write a quick digression to explain one topic in more detail. 
My structure would be something like

Section X (H1)
  [some normal text]

  Digression: Bla in detail (H2)
  [text of digression]

  [continue with text from Section X]


But that way, there is no clear part for the reader to see that the digression is over.

So how do I structurally return from a digression to continue with the initial topic? How are digressions usually structured and set apart from the rest of the section in conference/thesis papers? 

(Is it even good practice to have digressions?)
Maybe you can format it as a remark. These are essentially paragraphs typeset with a special header, a bit like theorems. Example from a paper in my field:



Note that the text of the paragraph is typeset in a roman typeface, not in italic like a theorem. If you are using Latex, with amsmath, there is a command \theoremstyle{remark} that can be used to get theorem-like environments with that formatting.