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My rule of thumb is "the right information at the right time", especially in content that's supposed to be consumed on a topic rather than a chapter/book basis. Sure, this leads to some repetition ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/33599 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
My rule of thumb is "the right information at the right time", especially in content that's supposed to be consumed on a topic rather than a chapter/book basis. Sure, this leads to some repetition but with the latest and greatest reuse mechanisms in doc tools it shouldn't be a problem. I would probably place it in the requirements section of the task topic (if it's a task topic), or state it in a comments/requirements section in a reference-style table or list.