diff --git a/share/sgml/transpec/docbook-html.ts b/share/sgml/transpec/docbook-html.ts
index 07bc30d03e38..8c3dfb8cf1e5 100644
--- a/share/sgml/transpec/docbook-html.ts
+++ b/share/sgml/transpec/docbook-html.ts
@@ -111,6 +111,9 @@ ${_action &r.blkpe;t}</end>'>
 <!ENTITY r.hyphen "60">
 <!ENTITY r.nl "61">
 
+<!ENTITY r.inchdr "70">
+<!ENTITY r.incftr "71">
+
 <!ENTITY cmap SYSTEM "/usr/share/sgml/transpec/html.cmap">
 <!ENTITY sdata SYSTEM "/usr/share/sgml/transpec/html.sdata">
 
@@ -431,8 +434,10 @@ ${_action &r.blkpe;t}</end>
 <start>^&lt;!-- Generated on ${date} using ${transpec} -->
 &lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
 &lt;HTML>&lt;TITLE>${_followrel descendant TITLE &r.pass;}&lt;/TITLE>
-&lt;BODY BGCOLOR="#FFFFFF" TEXT="#000000">^</start>
+&lt;BODY BGCOLOR="#FFFFFF" TEXT="#000000">
+${_isset inchdr &r.inchdr;}^</start>
 <end>^${_set fnotenum 1}${_action &r.fnote;t}
+${_isset incftr &r.incftr;}
 &lt;/BODY>&lt;/HTML></end>
 </rule>
 
@@ -757,6 +762,13 @@ ${_action &r.blkpe;t}</end>
 <gi>ENTRYTBL
 </rule>
 
+<rule> <!-- Environmental variable -->
+<match>
+<gi>ENVVAR
+<action>
+&m.tt;
+</rule>
+
 <rule> <!-- Brief text set at the beginning of a document as relevant to its content -->
 <match>
 <gi>EPIGRAPH
@@ -1602,6 +1614,14 @@ ${_action &r.blkpe;t}</end>
 <gi>PROGRAMLISTINGCO
 </rule>
 
+<rule> <!-- Character indicating the start of an input field in a
+            computer display -->
+<match>
+<gi>PROMPT
+<action>
+&m.tt;
+</rule>
+
 <rule> <!-- Defined set of data associated with a window -->
 <match>
 <gi>PROPERTY
@@ -2804,4 +2824,22 @@ ${_find top gi FOOTNOTE &r.fnotei;}
 <replace>^</replace>
 </rule>
 
+<!-- Insert a header file -->
+<rule id="&r.inchdr;">
+<match>
+<varval>inchdr .
+<action>
+<replace>${_include ${inchdr}}</replace>
+</rule>
+
+<!-- Insert a footer file -->
+<rule id="&r.incftr;">
+<match>
+<varval>incftr .
+<action>
+<replace>${_include ${incftr}}</replace>
+</rule>
+
+
+
 </transpec>
diff --git a/usr.bin/sgmlfmt/sgmlfmt.pl b/usr.bin/sgmlfmt/sgmlfmt.pl
index de6b1f390117..0df4e7a23cf7 100755
--- a/usr.bin/sgmlfmt/sgmlfmt.pl
+++ b/usr.bin/sgmlfmt/sgmlfmt.pl
@@ -112,7 +112,7 @@ sub sgmlparse {
 	$defines = "-i $defines";
     }
     open($ifhandle, "$sgmls $defines $decl $file | " . 
-    	"$instant -Dfilename=$fileroot -t ${dtd}-${replacement}.ts |");
+    	"$instant -Dfilename=$fileroot $instantopts -t ${dtd}-${replacement}.ts |");
 }
 
 #
@@ -696,6 +696,8 @@ sub main {
     	$dtd = "docbook";
     	$decl = "/usr/share/sgml/docbook/docbook.dcl";
     	if ($opt_f eq 'html') {
+    	    if ($opt_hdr) {$instantopts .= " -D \"inchdr=${opt_hdr}\"";}
+    	    if ($opt_ftr) {$instantopts .= " -D \"incftr=${opt_ftr}\"";}
     	    &docbook_html();
     	}
 	else {