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diff --git a/gdb/doc/gdbint.texinfo b/gdb/doc/gdbint.texinfo
index 4bbdf09..0793ddb 100644
--- a/gdb/doc/gdbint.texinfo
+++ b/gdb/doc/gdbint.texinfo
@@ -1398,6 +1398,15 @@ detect that GCC compiled the file. The default symbols are
@code{gcc_compiled.} and @code{gcc2_compiled.}, respectively. (Currently
only defined for the Delta 68.)
+@item GDB_MULTI_ARCH
+If defined and non-zero, enables suport for multiple architectures
+within GDB.
+
+The support can be enabled at two levels. At level one, only
+definitions for previously undefined macros are provided; at level two,
+a multi-arch definition of all architecture dependant macros will be
+defined.
+
@item GDB_TARGET_IS_HPPA
This determines whether horrible kludge code in dbxread.c and
partial-stab.h is used to mangle multiple-symbol-table files from