diff --git a/reference/errorfunc/ini.xml b/reference/errorfunc/ini.xml
index e389230e16..07efb45f98 100644
--- a/reference/errorfunc/ini.xml
+++ b/reference/errorfunc/ini.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.21 $ -->
+<!-- $Revision: 1.22 $ -->
 <section id="errorfunc.configuration">
  &reftitle.runtime;
  &extension.runtime;
@@ -222,6 +222,8 @@
       <link linkend="ini.error-log">error_log</link> information about
       the source is added. The default is 1024 and 0 allows to not apply
       any maximum length at all.
+      This length is applied to logged errors, displayed errors and also to
+      <link linkend="reserved.variables.phperrormsg">$php_errormsg</link>.
      </para>
     </listitem>
    </varlistentry>