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-rw-r--r--doc/pies.texi2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/pies.texi b/doc/pies.texi
index 3bcb349..46e1b91 100644
--- a/doc/pies.texi
+++ b/doc/pies.texi
@@ -2666,7 +2666,7 @@ Restart components named in the command line. @xref{pies-restart}.
@item --version
Display program version and license information and exit.
-@xopindex{undefine}
+@opsummary{undefine}
@item --undefine=@var{sym}
@itemx -U @var{sym}
Undefine symbol @var{sym}. @xref{Preprocessor}.

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