diff --git a/reference/strings/functions/stristr.xml b/reference/strings/functions/stristr.xml
index 2345630ba7..0e79856dcb 100644
--- a/reference/strings/functions/stristr.xml
+++ b/reference/strings/functions/stristr.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.17 $ -->
+<!-- $Revision: 1.18 $ -->
 <refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.stristr">
  <refnamediv>
   <refname>stristr</refname>
@@ -12,7 +12,7 @@
    <type>string</type><methodname>stristr</methodname>
    <methodparam><type>string</type><parameter>haystack</parameter></methodparam>
    <methodparam><type>mixed</type><parameter>needle</parameter></methodparam>
-   <methodparam><type>bool</type><parameter>before_needle</parameter></methodparam>
+   <methodparam choice="opt"><type>bool</type><parameter>before_needle</parameter></methodparam>
   </methodsynopsis>
   <para>
    Returns all of <parameter>haystack</parameter> from the first
@@ -82,7 +82,7 @@
       <row>
        <entry>6.0.0</entry>
        <entry>
-        Added the <parameter>before_needle</parameter> parameter.
+        Added the optional parameter <parameter>before_needle</parameter>.
        </entry>
       </row>
       <row>
diff --git a/reference/strings/functions/strstr.xml b/reference/strings/functions/strstr.xml
index 891416136b..736491d928 100644
--- a/reference/strings/functions/strstr.xml
+++ b/reference/strings/functions/strstr.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.14 $ -->
+<!-- $Revision: 1.15 $ -->
 <refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.strstr">
  <refnamediv>
   <refname>strstr</refname>
@@ -12,7 +12,7 @@
    <type>string</type><methodname>strstr</methodname>
    <methodparam><type>string</type><parameter>haystack</parameter></methodparam>
    <methodparam><type>mixed</type><parameter>needle</parameter></methodparam>
-   <methodparam><type>bool</type><parameter>before_needle</parameter></methodparam>
+   <methodparam choice="opt"><type>bool</type><parameter>before_needle</parameter></methodparam>
   </methodsynopsis>
   <para>
    Returns part of <parameter>haystack</parameter> string from the first
@@ -92,7 +92,7 @@
       <row>
        <entry>6.0.0</entry>
        <entry>
-        Added the <parameter>before_needle</parameter> parameter.
+        Added the optional parameter <parameter>before_needle</parameter>.
        </entry>
       </row>
       <row>