diff --git a/documentation/index.html b/documentation/index.html
index 0a70fbd5ed79c320e69a55851807611abfce932c..5451b29fb67696a9baee12b42563f1e4e91d652a 100644
--- a/documentation/index.html
+++ b/documentation/index.html
@@ -312,7 +312,10 @@ area of memory.</p>
  <h3>Passing functions</h3>
  <p>
  Functions that are passed to GSL functions (known as <i>callbacks</i>
- in C) are specified with function designator for the CL function.
+ in C) are specified with a
+ <a href="http://www.lispworks.com/documentation/HyperSpec/Body/26_glo_f.htm#function_designator">function
+ designator</a> for the CL function, that is, either the function
+ object itself or a symbol denoting the function.
  There is usually an option <code>scalarsp</code> for functions
  that take or return arrays that, if true, will
  send the user function the argument element by element, and expect
@@ -385,7 +388,7 @@ and arrays used internally or for function return.
 <!-- Created: Feb 25 2005 -->
 <!-- hhmts start -->
 <small>
-Time-stamp: <2009-03-31 22:27:06EDT index.html>
+Time-stamp: <2009-03-31 22:41:54EDT index.html>
 </small>
 <!-- hhmts end -->
  </div>