diff --git a/reference/math/functions/log.xml b/reference/math/functions/log.xml
index 095a03ce92..488063ab62 100644
--- a/reference/math/functions/log.xml
+++ b/reference/math/functions/log.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.13 $ -->
+<!-- $Revision: 1.14 $ -->
 <refentry xml:id="function.log" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>log</refname>
@@ -35,7 +35,7 @@
      <term><parameter>base</parameter></term>
      <listitem>
       <para>
-       The optinal logarithmic base to use 
+       The optional logarithmic base to use 
        (defaults to 'e' and so to the natural logarithm).
       </para>
      </listitem>