diff --git a/reference/strings/functions/substr-compare.xml b/reference/strings/functions/substr-compare.xml
new file mode 100644
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+++ b/reference/strings/functions/substr-compare.xml
@@ -0,0 +1,45 @@
+<?xml version='1.0' encoding='iso-8859-1'?>
+<!-- $Revision: 1.1 $ -->
+  <refentry id="function.substr-compare">
+   <refnamediv>
+    <refname>substr_compare</refname>
+    <refpurpose>
+     Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters
+    </refpurpose>
+   </refnamediv>
+   <refsect1>
+    <title>Description</title>
+    <methodsynopsis>
+     <type>int</type><methodname>substr_compare</methodname>
+     <methodparam><type>string</type><parameter>main_str</parameter></methodparam>
+     <methodparam><type>string</type><parameter>str</parameter></methodparam>
+     <methodparam><type>int</type><parameter>offset</parameter></methodparam>
+     <methodparam choice="opt"><type>int</type><parameter>length</parameter></methodparam>
+     <methodparam choice="opt"><type>bool</type><parameter>case_sensitivity</parameter></methodparam>
+    </methodsynopsis>
+
+     &warn.undocumented.func;
+
+   </refsect1>
+  </refentry>
+
+<!-- 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
+indent-tabs-mode:nil
+sgml-parent-document:nil
+sgml-default-dtd-file:"../../../../manual.ced"
+sgml-exposed-tags:nil
+sgml-local-catalogs:nil
+sgml-local-ecat-files:nil
+End:
+vim600: syn=xml fen fdm=syntax fdl=2 si
+vim: et tw=78 syn=sgml
+vi: ts=1 sw=1
+-->