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   gitattributes    ( 5 )

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USING MACRO ATTRIBUTES

You do not want any end-of-line conversions applied to, nor
       textual diffs produced for, any binary file you track. You would
       need to specify e.g.

           *.jpg -text -diff

       but that may become cumbersome, when you have many attributes.
       Using macro attributes, you can define an attribute that, when
       set, also sets or unsets a number of other attributes at the same
       time. The system knows a built-in macro attribute, binary:

           *.jpg binary

       Setting the "binary" attribute also unsets the "text" and "diff"
       attributes as above. Note that macro attributes can only be
       "Set", though setting one might have the effect of setting or
       unsetting other attributes or even returning other attributes to
       the "Unspecified" state.