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-rw-r--r--manual/creature.texi1
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diff --git a/manual/creature.texi b/manual/creature.texi
index 5eb665d2ef..edac770f6c 100644
--- a/manual/creature.texi
+++ b/manual/creature.texi
@@ -73,6 +73,7 @@ included as well as the @w{ISO C}, POSIX.1, POSIX.2, and X/Open material.
@comment (none)
@comment XOPEN
@defvr Macro _XOPEN_SOURCE
+@defvrx Macro _XOPEN_SOURCE_EXTENDED
If you define this macro, functionality described in the X/Open
Portability Guide is included. This is a superset of the POSIX.1 and
POSIX.2 functionality and in fact @code{_POSIX_SOURCE} and