diff --git a/documentation/trunk/doxygen/Doxyfile b/documentation/trunk/doxygen/Doxyfile
index 0f38dae1ac0963fd71009d4d98da2e391235dedf..58430d124fc9ed07f0273ce214995a77a09ab6d3 100755
--- a/documentation/trunk/doxygen/Doxyfile
+++ b/documentation/trunk/doxygen/Doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = CLASS
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 4
+PROJECT_NUMBER         = 4.1
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a