@findex EXTRA_CONSTRAINT
@item EXTRA_CONSTRAINT (@var{value}, @var{c})
A C expression that defines the optional machine-dependent constraint
-letters (@item @samp{Q}, @samp{R}, @samp{S}, @dots{} @samp{U}) that can
+letters (@item @samp{Q}, @samp{R}, @samp{S}, @samp{T}, @samp{U}) that can
be used to segregate specific types of operands, usually memory
references, for the target machine. Normally this macro will not be
defined. If it is required for a particular target machine, it should