How to put a tooltip on a user-defined function

Not a tooltip solution but an adequate workaround:

Start typing the UDF =MyUDF( then press CTRL + Shift + A and your function parameters will be displayed. So long as those parameters have meaningful names you at-least have a viable prompt

For example, this:

=MyUDF( + CTRL + Shift + A

Turns into this:

=MyUDF(sPath, sFileName)

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