diff --git a/mrw/regexp.hpp b/mrw/regexp.hpp
index 1926a38..f432512 100644
--- a/mrw/regexp.hpp
+++ b/mrw/regexp.hpp
@@ -9,6 +9,9 @@
     @license LGPL, see file <a href="license.html">COPYING</a>
 
     $Log$
+    Revision 1.6  2005/01/28 07:52:00  marc
+    added #include to documentation
+
     Revision 1.5  2004/12/20 13:21:49  marc
     #ifndef forgotten
 
@@ -40,6 +43,8 @@ namespace mrw {
   //@{
   /** @defgroup regexpregexp Regular Expressions
 
+      @pre #include <mrw/regexp.hpp>
+      
       A simple wrapper around the C POSIX regular expression library
       with a C++ Interface.