In general you should aim to localise the understanding of the code to the current context. By that I mean, the bit of code you are looking at now should be written so its purpose is clear without having to refer to other materials.

Generally that means rewriting something like:

setOptions (1, 0, 'e');
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as:

setOptions (send_log => 1, suppress_warnings => 0, max_level => 'e');
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A little more verbose, but now (even without the context) it's pretty clear what the parameters do and what setOption is likely to achieve.

Or to paraphrase a great man: make your code as clear as possible, but no clearer :).