diff --git a/usr.bin/yacc/PSD.doc/Makefile b/usr.bin/yacc/PSD.doc/Makefile
index f2f27cf1201..670d0c0b8db 100644
--- a/usr.bin/yacc/PSD.doc/Makefile
+++ b/usr.bin/yacc/PSD.doc/Makefile
@@ -1,8 +1,8 @@
-#	$OpenBSD: Makefile,v 1.2 2004/02/01 14:38:47 jmc Exp $
+#	$OpenBSD: Makefile,v 1.3 2020/12/19 02:57:03 daniel Exp $
 #	@(#)Makefile	8.1 (Berkeley) 8/14/93
 
 DIR=	psd/15.yacc
-SRCS=	ss.. ss0 ss1 ss2 ss3 ss4 ss5 ss6 ss7 ss8 ss9 ssA ssB ssa ssb ssc ssd
+SRCS=	ss_ ss0 ss1 ss2 ss3 ss4 ss5 ss6 ss7 ss8 ss9 ss10 ss11 ssa ssb ssc ssd
 MACROS=	-ms
 REFER=	refer -e # -p /usr/share/dict/papers/Ind
 
diff --git a/usr.bin/yacc/PSD.doc/ssA b/usr.bin/yacc/PSD.doc/ss10
similarity index 99%
rename from usr.bin/yacc/PSD.doc/ssA
rename to usr.bin/yacc/PSD.doc/ss10
index b10bb74198c..f4bb6c56f73 100644
--- a/usr.bin/yacc/PSD.doc/ssA
+++ b/usr.bin/yacc/PSD.doc/ss10
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: ssA,v 1.1 2002/12/03 21:36:35 mickey Exp $
+.\"	$OpenBSD: ss10,v 1.1 2020/12/19 02:57:03 daniel Exp $
 .\"
 .\" Copyright (C) Caldera International Inc.  2001-2002.
 .\" All rights reserved.
diff --git a/usr.bin/yacc/PSD.doc/ssB b/usr.bin/yacc/PSD.doc/ss11
similarity index 97%
rename from usr.bin/yacc/PSD.doc/ssB
rename to usr.bin/yacc/PSD.doc/ss11
index 78da0d35a1b..e569079aa59 100644
--- a/usr.bin/yacc/PSD.doc/ssB
+++ b/usr.bin/yacc/PSD.doc/ss11
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: ssB,v 1.1 2002/12/03 21:36:35 mickey Exp $
+.\"	$OpenBSD: ss11,v 1.1 2020/12/19 02:57:03 daniel Exp $
 .\"
 .\" Copyright (C) Caldera International Inc.  2001-2002.
 .\" All rights reserved.
diff --git a/usr.bin/yacc/PSD.doc/ss.. b/usr.bin/yacc/PSD.doc/ss_
similarity index 98%
rename from usr.bin/yacc/PSD.doc/ss..
rename to usr.bin/yacc/PSD.doc/ss_
index 186a157b7d9..ef4885a90bd 100644
--- a/usr.bin/yacc/PSD.doc/ss..
+++ b/usr.bin/yacc/PSD.doc/ss_
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: ss..,v 1.1 2002/12/03 21:36:35 mickey Exp $
+.\"	$OpenBSD: ss_,v 1.1 2020/12/19 02:57:03 daniel Exp $
 .\"
 .\" Copyright (C) Caldera International Inc.  2001-2002.
 .\" All rights reserved.