diff --git a/chapters/install.xml b/chapters/install.xml
index 4aab8511d2..8ca067ceca 100644
--- a/chapters/install.xml
+++ b/chapters/install.xml
@@ -1,5 +1,5 @@
 <?xml encoding="iso-8859-1"?>
-<!-- $Revision: 1.76 $ -->
+<!-- $Revision: 1.77 $ -->
  <chapter id="installation">
   <title>Installation</title>
 
@@ -1564,6 +1564,20 @@ $ /usr/local/sbin/php4-enable
       </para>
      </listitem>
     </varlistentry>
+     <varlistentry id="install.configure.enable-pcntl">
+      <term>
+       <parameter>--enable-pcntl</parameter>
+      </term>
+      <listitem>
+       <para>
+	PHP 3: Option not available in PHP 3
+       </para>
+       <para>
+	PHP 4: Enable process control functions. (fork, waitpid,
+	signal, et. al.)
+       </para>
+      </listitem>
+     </varlistentry>
     <varlistentry id="install.configure.disable-rpath">
      <term>
       <parameter>--disable-rpath</parameter>