diff --git a/reference/intl/setup.xml b/reference/intl/setup.xml
index 8354f1c1a6..533e95fe7b 100644
--- a/reference/intl/setup.xml
+++ b/reference/intl/setup.xml
@@ -10,7 +10,7 @@
   <para>
    To build the extension you need to install the
    <link xlink:href="&url.icu.home;">ICU</link>
-   library of version 3.6+.
+   library, version 4.0.0 or newer is required.
   </para>
   <para>
    This extension is bundled with PHP as of PHP version 5.3.0.