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-rw-r--r--lisp/calc/calc-rules.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/calc/calc-rules.el b/lisp/calc/calc-rules.el
index 1b7526c3c9e..fe0e8a1e479 100644
--- a/lisp/calc/calc-rules.el
+++ b/lisp/calc/calc-rules.el
@@ -1,4 +1,4 @@
-;;; calc-rules.el --- rules for simplifying algebraic expressions in Calc
+;;; calc-rules.el --- rules for simplifying algebraic expressions in Calc -*- lexical-binding:t -*-
;; Copyright (C) 1990-1993, 2001-2020 Free Software Foundation, Inc.