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diff --git a/doc/mathfunc.n b/doc/mathfunc.n
index 3da6d5a..14b448e 100644
--- a/doc/mathfunc.n
+++ b/doc/mathfunc.n
@@ -299,3 +299,7 @@ Copyright (c) 1993 The Regents of the University of California.
Copyright (c) 1994-2000 Sun Microsystems Incorporated.
Copyright (c) 2005, 2006 by Kevin B. Kenny <kennykb@acm.org>.
.fi
+'\" Local Variables:
+'\" mode: nroff
+'\" fill-column: 78
+'\" End: