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-rw-r--r--doc/coreutils.texi4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index d8cc5b6a2..0b142c7ad 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -3681,11 +3681,13 @@ numbers of leading blanks in fields can cause confusing results.
Keys can span multiple fields.
@vindex _POSIX2_VERSION
+@vindex POSIXLY_CORRECT
On older systems, @command{sort} supports an obsolete origin-zero
syntax @samp{+@var{pos1} [-@var{pos2}]} for specifying sort keys.
This obsolete behavior can be enabled or disabled with the
@env{_POSIX2_VERSION} environment variable (@pxref{Standards
-conformance}).
+conformance}); it can also be enabled when @env{POSIXLY_CORRECT} is
+not set by using the obsolete syntax with @samp{-@var{pos2}} present.
Scripts intended for use on standard hosts should avoid obsolete
syntax and should use @option{-k} instead. For example, avoid