diff --git a/functions/gmp.xml b/functions/gmp.xml
index 108bbaf1a7..7aaabaa749 100644
--- a/functions/gmp.xml
+++ b/functions/gmp.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.19 $ -->
+<!-- $Revision: 1.20 $ -->
  <reference id="ref.gmp">
   <title>GMP functions</title>
   <titleabbrev>GMP</titleabbrev>
@@ -486,6 +486,27 @@ print gmp_strval (fact (1000)) . "\n";
    </refsect1>
   </refentry>
 
+  <refentry id='function.gmp-com'>
+   <refnamediv>
+    <refname>gmp_com</refname>
+    <refpurpose>
+     Calculates one's complement of a
+    </refpurpose>
+   </refnamediv>
+   <refsect1>
+    <title>Description</title>
+    <funcsynopsis>
+     <funcprototype>
+      <funcdef>resource <function>gmp_com</function></funcdef>
+      <paramdef>resource <parameter>a</parameter></paramdef>
+     </funcprototype>
+    </funcsynopsis>
+    <para>
+     &warn.undocumented.func;
+    </para>
+   </refsect1>
+  </refentry>
+
   <refentry id="function.gmp-abs">
    <refnamediv>
     <refname>gmp_abs</refname>
@@ -563,7 +584,7 @@ print gmp_strval (fact (1000)) . "\n";
    </refsect1>
   </refentry>
 
-  <refentry id="function.gmp-sqrtrm">
+  <refentry id="function.gmp-sqrtrem">
    <refnamediv>
     <refname>gmp_sqrtrm</refname>
     <refpurpose>Square root with remainder</refpurpose>