diff --git a/language/functions.xml b/language/functions.xml
index 02290a1633..dcf8225cfb 100644
--- a/language/functions.xml
+++ b/language/functions.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.39 $ -->
+<!-- $Revision: 1.40 $ -->
  <chapter id="functions">
   <title>Functions</title>
 
@@ -252,7 +252,7 @@ Making a cup of espresso.
  
     <simpara>
      The default value must be a constant expression, not (for
-     example) a variable or class member.
+     example) a variable, a class member or a function call.
     </simpara>
     <para>
      Note that when using default arguments, any defaults should be on