DEFINING MACRO ATTRIBUTES
-------------------------
-Custom macro attributes can be defined only in the `.gitattributes`
-file at the toplevel (i.e. not in any subdirectory). The built-in
-macro attribute "binary" is equivalent to:
+Custom macro attributes can be defined only in top-level gitattributes
+files (`$GIT_DIR/info/attributes`, the `.gitattributes` file at the
+top level of the working tree, or the global or system-wide
+gitattributes files), not in `.gitattributes` files in working tree
+subdirectories. The built-in macro attribute "binary" is equivalent
+to:
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[attr]binary -diff -merge -text