diff --git a/Doxyfile b/Doxyfile
index 07d2a36..68af975 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -48,13 +48,13 @@ PROJECT_NAME           = J3ML
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         =
+PROJECT_NUMBER         = 3.1
 
 # 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
 # quick idea about the purpose of the project. Keep the description short.
 
-PROJECT_BRIEF          = "Linear Algebra, Geometry, and Algorithms in C++"
+PROJECT_BRIEF          = "Linear Algebra, Geometry, and Algorithms in C++ (v3.1)"
 
 # With the PROJECT_LOGO tag one can specify a logo or an icon that is included
 # in the documentation. The maximum height of the logo should not exceed 55