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diff --git a/contrib/chem/examples/122/ch4z2_text.chem b/contrib/chem/examples/122/ch4z2_text.chem
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+ch4z2_text.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>.
+
+########################################################################
+
+    bond 120 dotted
+    bond 120 length .3 ; BP
+    back bond -120 length .25 from BP ; H
+    front bond 120 length .25 from BP ; CH3
+    bond 60 length .5 from BP ; BP
+    bond -60 length .25 from BP ; H
+# note the pic move command to position the text
+    move left .35 ; "(ANTI)"
+    front bond 60 length .25 from BP ; H
+# another positioning of text
+    move right .35 ; "(SYN)"
+    bond 120 length .4 from BP ; BP
+    back bond -120 length .25 from BP ; H
+    front bond 120 length .25 from BP ; CH3
+    bond 60 length .5 from BP
+    bond 60 dotted
+
+# Local Variables:
+# mode: Nroff
+# End:
+.cend