diff --git a/language/oop5/interfaces.xml b/language/oop5/interfaces.xml
index 6bedfbf16b..72b4d3b329 100644
--- a/language/oop5/interfaces.xml
+++ b/language/oop5/interfaces.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.7 $ -->
+<!-- $Revision: 1.8 $ -->
  <sect1 id="language.oop5.interfaces">
   <title>Object Interfaces</title>
   <para>
@@ -24,6 +24,12 @@
     so will result in a fatal error. Classes may implement more than one interface
     if desired by separating each interface with a comma.
    </para>
+   <note>
+    <para>
+     A class cannot implement two interfaces that share function names, since
+     it would cause ambiguity.
+    </para>
+   </note>
   </sect2>
   <sect2>
    &reftitle.examples;