diff --git a/functions/swf.xml b/functions/swf.xml
index c5c9b242db..a8c8131053 100644
--- a/functions/swf.xml
+++ b/functions/swf.xml
@@ -1797,6 +1797,45 @@ swf_endButton ();
         </para>
       </refsect1>
     </refentry>
+
+    <refentry id="function.swf-ortho">
+      <refnamediv>
+        <refname>swf_ortho</refname>
+        <refpurpose>
+          Defines an orthographic mapping of user coordinates onto the current viewport
+        </refpurpose>
+      </refnamediv>
+      <refsect1>
+        <title>Description</title>
+        <funcsynopsis>
+          <funcdef>void 
+            <function>swf_ortho</function>
+          </funcdef>
+          <paramdef>double 
+            <parameter>xmin</parameter>
+          </paramdef>
+          <paramdef>double 
+            <parameter>xmax</parameter>
+          </paramdef>
+          <paramdef>double 
+            <parameter>ymin</parameter>
+          </paramdef>
+          <paramdef>double 
+            <parameter>ymax</parameter>
+          </paramdef>
+          <paramdef>double 
+            <parameter>zmin</parameter>
+          </paramdef>
+          <paramdef>double 
+            <parameter>zmax</parameter>
+          </paramdef>
+        </funcsynopsis>
+        <para>
+          The <function>swf_ortho</function> funcion defines a orthographic mapping of user
+          coordinates onto the current viewport.
+        </para>
+      </refsect1>
+    </refentry>
     
     <refentry id="function.swf-ortho2">
       <refnamediv>
@@ -2121,4 +2160,21 @@ swf_endButton ();
         </para>
       </refsect1>
     </refentry>
-</reference>
\ No newline at end of file
+</reference>
+
+<!-- Keep this comment at the end of the file
+Local variables:
+mode: sgml
+sgml-omittag:t
+sgml-shorttag:t
+sgml-minimize-attributes:nil
+sgml-always-quote-attributes:t
+sgml-indent-step:1
+sgml-indent-data:t
+sgml-parent-document:nil
+sgml-default-dtd-file:"../../manual.ced"
+sgml-exposed-tags:nil
+sgml-local-catalogs:nil
+sgml-local-ecat-files:nil
+End:
+-->
\ No newline at end of file