diff --git a/ext/tk/MANIFEST b/ext/tk/MANIFEST
index 704a33d582..c20ee7ffa3 100644
--- a/ext/tk/MANIFEST
+++ b/ext/tk/MANIFEST
@@ -29,6 +29,7 @@ sample/tkfrom.rb
 sample/tkhello.rb
 sample/tkline.rb
 sample/tkmenubutton.rb
+sample/tkoptdb-safeTk.rb
 sample/tkoptdb.rb
 sample/resource.ja
 sample/resource.en
diff --git a/ext/tk/sample/tkoptdb-safeTk.rb b/ext/tk/sample/tkoptdb-safeTk.rb
new file mode 100644
index 0000000000..169cd3c171
--- /dev/null
+++ b/ext/tk/sample/tkoptdb-safeTk.rb
@@ -0,0 +1,18 @@
+#!/usr/bin/env ruby
+
+require 'multi-tk'
+
+TkMessage.new(:text => <<EOM).pack
+This is a sample of the safe-Tk slave interpreter. \
+On the slave interpreter, 'tkoptdb.rb' demo is running. 
+The window shown this message is a root widget of \
+the default master interpreter. The other window \
+is a toplevel widget of the master interpreter, and it \
+has a container frame of the safe-Tk slave interpreter. \
+You can delete the slave by the button on the toplevel widget.
+EOM
+
+file = File.expand_path('tkoptdb.rb', File.dirname(__FILE__))
+MultiTkIp.new_safeTk{load file}
+
+# mainloop is started on 'tkoptdb.rb'