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diff --git a/contrib/chem/examples/122/ch5a_size.chem b/contrib/chem/examples/122/ch5a_size.chem
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+ch5a_size.chem:
+.br
+.cstart
+
+# Example file for 'chem':
+
+# This originates from Computing Science Technical Report No. 122
+#   CHEM - A Program for Typesetting Chemical Diagrams: User Manual
+#   by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
+#   <http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
+
+# Copyright (C) 2006-2020 Free Software Foundation, Inc.
+
+# This file is part of 'chem', which is part of 'groff'.
+
+# 'groff' is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License (GPL) version 2 as
+# published by the Free Software Foundation.
+
+# 'groff' is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# The GPL2 license text is available in the internet at
+# <http://www.gnu.org/licenses/gpl-2.0.html>.
+
+########################################################################
+
+.ps 14
+size 16
+R: ring6 put O at 1 put C at 2 put O at 3 put C at 4 put O at 5 put C at 6
+   double bond 60 from R.V2 ; NH
+   double bond down from R.V4 ; NH
+   double bond -60 from R.V6 ; HN
+size 10 # if you are doing more than one
+.ps 10
+
+# Local Variables:
+# mode: Nroff
+# End:
+.cend