Idiom for bringing up a topic in text prematurely

Question

I'm writing a thesis, and have to bring up a concept which is part of the topic in the following section. I suppose I am looking for an idiomatic way to "excuse" this break of flow.

In Norwegian there is a phrase/idiom for bringing up a topic earlier than what would seem natural: "foregripe begivenheten". Directly translated it is "anticipate the event", but this does not seem fitting.

Edit: Many great answers below. I simply accepted the one I ended up using. This is not to say that any of the other answers are less good. I wouldn't know.

Answer 1

At first I thought "jump the gun" might work here. However, I think a better choice would be to "get ahead of myself".

From wiktionary get ahead of oneself

• (idiomatic) To speak or write in a manner in which one makes points out of logical or chronological sequence.
• (idiomatic) To develop an opinion based on insufficient information or to take action prematurely.
• (idiomatic) To focus excessively on one's plans or on prospective future events without paying adequate attention to the present.

So one might say, "I may be getting ahead of myself here, but I wish to mention that .... "

Answer 2

to anticipate (the topic)

2.1 Come or take place before (an event or process expected or scheduled for a later time)
‘this is to anticipate the argument’

(Oxford)

Answer 3

If the idea is to give a hint of what might follow:

foreshadow from Oxford Living Dictionaries

Be a warning or indication of (a future event)

‘other new measures are foreshadowed in the White Paper’

‘It establishes a mood and foreshadows future events.’

'Foreshadow' is a bit more common to my ear when used as a device in fiction or film yet the examples in the dictionary above use it more broadly.