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-rw-r--r--doc/info/chap/introduction.texinfo6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/info/chap/introduction.texinfo b/doc/info/chap/introduction.texinfo
index 92f6273..ba08dbe 100644
--- a/doc/info/chap/introduction.texinfo
+++ b/doc/info/chap/introduction.texinfo
@@ -398,6 +398,12 @@ or @sc{SVID}@. To override this, define
@code{_GNU_SOURCE} does not automatically
define @code{_BSD_SOURCE} or @code{_SVID_SOURCE}@.
+@item _PLAN9_SOURCE
+@cpindex Plan 9 from Bell Labs
+@lvindex _PLAN9_SOURCE
+Enables extensions from Plan 9 from Bell Labs
+C standard library.
+
@end table
@c TODO: _LARGEFILE_SUPPORT
@c TODO: _LARGEFILE64_SUPPORT