diff --git a/reference/spl/cachingiterator/construct.xml b/reference/spl/cachingiterator/construct.xml
index 4da0cf5a20..e80158c7bb 100644
--- a/reference/spl/cachingiterator/construct.xml
+++ b/reference/spl/cachingiterator/construct.xml
@@ -12,7 +12,7 @@
   <methodsynopsis>
    <modifier>public</modifier> <methodname>CachingIterator::__construct</methodname>
    <methodparam><type>Iterator</type><parameter>iterator</parameter></methodparam>
-   <methodparam choice="opt"><type>string</type><parameter>flags</parameter></methodparam>
+   <methodparam choice="opt"><type>string</type><parameter>flags</parameter><initializer>self::CALL_TOSTRING</initializer></methodparam>
   </methodsynopsis>
   
   &warn.undocumented.func;
diff --git a/reference/spl/recursiveregexiterator/construct.xml b/reference/spl/recursiveregexiterator/construct.xml
index 969f216cad..cde37439e0 100644
--- a/reference/spl/recursiveregexiterator/construct.xml
+++ b/reference/spl/recursiveregexiterator/construct.xml
@@ -13,9 +13,9 @@
    <modifier>public</modifier> <methodname>RecursiveRegexIterator::__construct</methodname>
    <methodparam><type>RecursiveIterator</type><parameter>iterator</parameter></methodparam>
    <methodparam><type>string</type><parameter>regex</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>mode</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>flags</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>preg_flags</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer>self::MATCH</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>0</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>preg_flags</parameter><initializer>0</initializer></methodparam>
   </constructorsynopsis>
 
   <para>
diff --git a/reference/spl/regexiterator/construct.xml b/reference/spl/regexiterator/construct.xml
index 7fc9ad3527..a64b290826 100644
--- a/reference/spl/regexiterator/construct.xml
+++ b/reference/spl/regexiterator/construct.xml
@@ -13,9 +13,9 @@
    <modifier>public</modifier> <methodname>RegexIterator::__construct</methodname>
    <methodparam><type>Iterator</type><parameter>iterator</parameter></methodparam>
    <methodparam><type>string</type><parameter>regex</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>mode</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>flags</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>preg_flags</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer>self::MATCH</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>0</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>preg_flags</parameter><initializer>0</initializer></methodparam>
   </constructorsynopsis>
 
   <para>