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As long as "a few words" is less than 50, sure, go for it. It's additional interstitial information which can be useful to the reader, or can at least add background and flavor. More than two par...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/20850 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/20850 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
As long as "a few words" is less than 50, sure, go for it. It's additional interstitial information which can be useful to the reader, or can at least add background and flavor. More than two paragraphs about the Merovingian boll weevil will probably annoy people, so keep it brief. If you need more than that, either make it a [prologue](https://writers.stackexchange.com/questions/9505/when-do-i-explain-my-created-world-scenario-in-a-prologue-vs-letting-it-unfold) or find some way for a [cabbagehead](https://writers.stackexchange.com/questions/3811/how-can-i-break-up-a-lengthy-explanation/) character to look up the information.