When I use \index{Alf|see {Alfred}} I get the warning :

unknown cross-reference-class `see '! (ignored)

I dont want to use seealso;

  • Have you tried using it without the space (\index{Alf|see{Alfref}})?
    – TeXnician
    Nov 20, 2017 at 16:31

1 Answer 1


You have to note that xindy does search for its keywords and a group, meaning that it wants something like see{Quack} or seealso{Quack}. The faulty piece is the space in your code. You should use \index{Alf|see{Alfred}} instead.

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