diff --git a/man/directives-template.xml b/man/directives-template.xml
index 34b103de40..f28bd98d25 100644
--- a/man/directives-template.xml
+++ b/man/directives-template.xml
@@ -132,11 +132,17 @@
   <refsect1>
     <title>Constants</title>
 
-    <para>Various constant used and/or defined by systemd.</para>
+    <para>Various constants used and/or defined by systemd.</para>
 
     <variablelist id='constants' />
   </refsect1>
 
+  <refsect1>
+    <title>DNS resource record types</title>
+
+    <variablelist id='dns' />
+  </refsect1>
+
   <refsect1>
     <title>Miscellaneous options and directives</title>
 
diff --git a/tools/make-directive-index.py b/tools/make-directive-index.py
index bbdc5572f5..8a2939959b 100755
--- a/tools/make-directive-index.py
+++ b/tools/make-directive-index.py
@@ -77,13 +77,14 @@ def _extract_directives(directive_groups, formatting, page):
                 storfile[text].append((pagename, section))
                 formatting[text] = name
 
-    storfile = directive_groups['constants']
     for name in t.iterfind('.//constant'):
         if name.attrib.get('index') == 'false':
             continue
         name.tail = ''
         if name.text.startswith('('): # a cast, strip it
             name.text = name.text.partition(' ')[2]
+        klass = name.attrib.get('class') or 'constants'
+        storfile = directive_groups[klass]
         storfile[name.text].append((pagename, section))
         formatting[name.text] = name