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-rw-r--r--ext/tk/sample/demos-jp/pendulum.rb1
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diff --git a/ext/tk/sample/demos-jp/pendulum.rb b/ext/tk/sample/demos-jp/pendulum.rb
index d703c74d5a..c245136d5c 100644
--- a/ext/tk/sample/demos-jp/pendulum.rb
+++ b/ext/tk/sample/demos-jp/pendulum.rb
@@ -1,3 +1,4 @@
+# -*- coding: euc-jp -*-
#
# This demonstration illustrates how Tcl/Tk can be used to construct
# simulations of physical systems.