diff --git a/reference/filesystem/constants.xml b/reference/filesystem/constants.xml
index 18248848cf..b3b8d97db1 100644
--- a/reference/filesystem/constants.xml
+++ b/reference/filesystem/constants.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <section id="filesystem.constants">
  &reftitle.constants;
  &extension.constants;
@@ -121,7 +121,8 @@
    </term>
    <listitem>
     <simpara>
-
+     Since PHP 5.0.0. Search for <parameter>filename<parameter> in
+     <link linkend="ini.include-path">include_path</link>.
     </simpara>
    </listitem>
   </varlistentry>
@@ -143,7 +144,7 @@
    </term>
    <listitem>
     <simpara>
-
+     Since PHP 5.0.0. Strips EOL characters.
     </simpara>
    </listitem>
   </varlistentry>
@@ -154,7 +155,7 @@
    </term>
    <listitem>
     <simpara>
-
+     Since PHP 5.0.0. Skips empty lines.
     </simpara>
    </listitem>
   </varlistentry>