diff --git a/reference/strings/functions/substr-compare.xml b/reference/strings/functions/substr-compare.xml
index defde59728..0ca3510318 100644
--- a/reference/strings/functions/substr-compare.xml
+++ b/reference/strings/functions/substr-compare.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.1 $ -->
+<!-- $Revision: 1.2 $ -->
   <refentry id="function.substr-compare">
    <refnamediv>
     <refname>substr_compare</refname>
@@ -18,7 +18,40 @@
      <methodparam choice="opt"><type>bool</type><parameter>case_sensitivity</parameter></methodparam>
     </methodsynopsis>
 
-     &warn.undocumented.func;
+    <para>
+     <function>substr_compare</function> compares <parameter>main_str</parameter>
+     from position <parameter>offset</parameter> with <parameter>str</parameter>
+     up to <parameter>length</parameter> characters.
+    </para>
+    <para>
+     Returns &lt; 0 if <parameter>main_str</parameter> from position
+     <parameter>offset</parameter> is less than <parameter>str</parameter>, &gt;
+     0 if it is greater than <parameter>str</parameter>, and 0 if they are equal.
+     If <parameter>length</parameter> is equal or greater than length of
+     <parameter>main_str</parameter> and <parameter>length</parameter> is set,
+     <function>substr_compare</function> prints warning and returns &false;.
+    </para>
+    <para>
+     If <parameter>case_sensitivity</parameter> is &true;, comparison is case
+     sensitive.
+    </para>
+    <para>
+     <example>
+      <title>A <function>substr_compare</function> example</title>
+      <programlisting role="php">
+<![CDATA[
+<?php
+echo substr_compare("abcde", "bc", 1, 2); // 0
+echo substr_compare("abcde", "bcg", 1, 2); // 0
+echo substr_compare("abcde", "BC", 1, 2, true); // 0
+echo substr_compare("abcde", "bc", 1, 3); // 1
+echo substr_compare("abcde", "cd", 1, 2); // -1
+echo substr_compare("abcde", "abc", 5, 1); // warning
+?>
+]]>
+      </programlisting>
+     </example>
+    </para>
 
    </refsect1>
   </refentry>