diff --git a/reference/strings/functions/sha1.xml b/reference/strings/functions/sha1.xml
new file mode 100644
index 0000000000..04a501bca6
--- /dev/null
+++ b/reference/strings/functions/sha1.xml
@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- $Revision: 1.1 $ -->
+  <refentry id="function.sha1">
+   <refnamediv>
+    <refname>sha1</refname>
+    <refpurpose>Calculate the sha1 hash of a string</refpurpose>
+   </refnamediv>
+   <refsect1>
+    <title>Description</title>
+     <methodsynopsis>
+      <type>string</type><methodname>sha1</methodname>
+      <methodparam><type>string</type><parameter>str</parameter></methodparam>
+     </methodsynopsis>
+    <simpara>
+     Calculates the sha1 hash of <parameter>str</parameter> using the
+     <ulink url="&url.rfc;rfc1321.html">US Secure Hash Algorithm 1</ulink>,
+     and returns that hash. The hash is a 40-character hexadecimal number.
+    </simpara>
+    <simpara>
+     See also <function>crc32</function> and <function>md5</function>
+    </simpara>
+   </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
+-->