diff --git a/reference/xml/functions/xml-get-current-byte-index.xml b/reference/xml/functions/xml-get-current-byte-index.xml
index 8ad378c990..0438b18de1 100644
--- a/reference/xml/functions/xml-get-current-byte-index.xml
+++ b/reference/xml/functions/xml-get-current-byte-index.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
   <refentry id="function.xml-get-current-byte-index">
    <refnamediv>
     <refname>xml_get_current_byte_index</refname>
@@ -38,6 +38,15 @@
      the parser is currently at in its data buffer (starting at 0).
     </para>
    </refsect1>
+   <refsect1 role="notes">
+    &reftitle.notes;
+    <warning>
+     <para>
+      This function returns byte index according to UTF-8 encoded text
+      disregarding if input is in another encoding.
+     </para>
+    </warning>
+   </refsect1>
    <refsect1 role="seealso">
     &reftitle.seealso;
     <para>