doc: resynchronize manpage with in-code help

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/ip6tables.8.in b/ip6tables.8.in
index 3d19a4c..a31887e 100644
--- a/ip6tables.8.in
+++ b/ip6tables.8.in
@@ -30,16 +30,16 @@
 \fBip6tables\fP [\fB\-t\fP \fItable\fP] {\fB\-A\fP|\fB\-D\fP} \fIchain
 rule-specification\fP [\fIoptions...\fP]
 .PP
-\fBip6tables\fP [\fB\-t\fP \fItable\fP] \fB\-I\fP [\fIrulenum\fP]
+\fBip6tables\fP [\fB\-t\fP \fItable\fP] \fB\-I\fP \fIchain\fP [\fIrulenum\fP]
 \fIrule-specification\fP [\fIoptions...\fP]
 .PP
-\fBip6tables\fP [\fB\-t\fP \fItable\fP] \fB\-R\fP \fIrulenum
+\fBip6tables\fP [\fB\-t\fP \fItable\fP] \fB\-R\fP \fIchain rulenum
 rule-specification\fP [\fIoptions...\fP]
 .PP
 \fBip6tables\fP [\fB\-t\fP \fItable\fP] \fB\-D\fP \fIchain rulenum\fP
 [\fIoptions...\fP]
 .PP
-\fBip6tables\fP [\fB\-t\fP \fItable\fP] \fB\-S\fP [\fIchain\fP]
+\fBip6tables\fP [\fB\-t\fP \fItable\fP] \fB\-S\fP [\fIchain\fP [\fIrulenum\fP]]
 .PP
 \fBip6tables\fP [\fB\-t\fP \fItable\fP] {\fB\-F\fP|\fB\-L\fP|\fB\-Z\fP}
 [\fIchain\fP] [\fIoptions...\fP]
diff --git a/ip6tables.c b/ip6tables.c
index 06c0a60..7847ebc 100644
--- a/ip6tables.c
+++ b/ip6tables.c
@@ -240,7 +240,8 @@
 
 	printf("%s v%s\n\n"
 "Usage: %s -[AD] chain rule-specification [options]\n"
-"       %s -[RI] chain rulenum rule-specification [options]\n"
+"       %s -I chain [rulenum] rule-specification [options]\n"
+"       %s -R chain rulenum rule-specification [options]\n"
 "       %s -D chain rulenum [options]\n"
 "       %s -[LS] [chain [rulenum]] [options]\n"
 "       %s -[FZ] [chain] [options]\n"
@@ -250,7 +251,7 @@
 "       %s -h (print this help information)\n\n",
 	       prog_name, prog_vers, prog_name, prog_name,
 	       prog_name, prog_name, prog_name, prog_name,
-	       prog_name, prog_name, prog_name);
+	       prog_name, prog_name, prog_name, prog_name);
 
 	printf(
 "Commands:\n"
diff --git a/iptables.8.in b/iptables.8.in
index 2bbd9a7..10dcb73 100644
--- a/iptables.8.in
+++ b/iptables.8.in
@@ -27,13 +27,13 @@
 .SH SYNOPSIS
 \fBiptables\fP [\fB\-t\fP \fItable\fP] {\fB\-A\fP|\fB\-D\fP} \fIchain\fP \fIrule-specification\fP
 .PP
-\fBiptables\fP [\fB\-t\fP \fItable\fP] \fB\-I\fP [\fIrulenum\fP] \fIrule-specification\fP
+\fBiptables\fP [\fB\-t\fP \fItable\fP] \fB\-I\fP \fIchain\fP [\fIrulenum\fP] \fIrule-specification\fP
 .PP
-\fBiptables\fP [\fB\-t\fP \fItable\fP] \fB\-R\fP \fIrulenum rule-specification\fP
+\fBiptables\fP [\fB\-t\fP \fItable\fP] \fB\-R\fP \fIchain rulenum rule-specification\fP
 .PP
 \fBiptables\fP [\fB\-t\fP \fItable\fP] \fB\-D\fP \fIchain rulenum\fP
 .PP
-\fBiptables\fP [\fB\-t\fP \fItable\fP] \fB\-S\fP [\fIchain\fP]
+\fBiptables\fP [\fB\-t\fP \fItable\fP] \fB\-S\fP [\fIchain\fP [\fIrulenum\fP]]
 .PP
 \fBiptables\fP [\fB\-t\fP \fItable\fP] {\fB\-F\fP|\fB\-L\fP|\fB\-Z\fP} [\fIchain\fP] [\fIoptions...\fP]
 .PP
diff --git a/iptables.c b/iptables.c
index a8e97c7..8448c18 100644
--- a/iptables.c
+++ b/iptables.c
@@ -254,7 +254,8 @@
 
 	printf("%s v%s\n\n"
 "Usage: %s -[AD] chain rule-specification [options]\n"
-"       %s -[RI] chain rulenum rule-specification [options]\n"
+"       %s -I chain [rulenum] rule-specification [options]\n"
+"       %s -R chain rulenum rule-specification [options]\n"
 "       %s -D chain rulenum [options]\n"
 "       %s -[LS] [chain [rulenum]] [options]\n"
 "       %s -[FZ] [chain] [options]\n"
@@ -264,7 +265,7 @@
 "       %s -h (print this help information)\n\n",
 	       prog_name, prog_vers, prog_name, prog_name,
 	       prog_name, prog_name, prog_name, prog_name,
-	       prog_name, prog_name, prog_name);
+	       prog_name, prog_name, prog_name, prog_name);
 
 	printf(
 "Commands:\n"