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@@ -5725,6 +5725,8 @@ This attribute specifies the data type f
type corresponds to the mode @var{mode}. This in effect lets you
request an integer or floating-point type according to its width.
+@xref{Machine Modes,,, gccint, GNU Compiler Collection (GCC) Internals},
+for a list of the possible keywords for @var{mode}.
You may also specify a mode of @code{byte} or @code{__byte__} to
indicate the mode corresponding to a one-byte integer, @code{word} or
@code{__word__} for the mode of a one-word integer, and @code{pointer}