doxygen: mention that SHOW_NAMESPACES = NO is not supported.

diff --git a/doc/doxygen.rst b/doc/doxygen.rst
index 08a896e7b60b6fec5f43b2d55de0c9fc8ae7fde3..cd707bf714aa884099c0efe7b6801d761adc05b5 100644 (file)
--- a/doc/doxygen.rst
+++ b/doc/doxygen.rst
@@ -244,6 +244,9 @@ amount of generated content for no added value.
     option would be too much effort for too little gain and so m.css simply
     aborts if it discovers this option being enabled. Set it back to ``NO`` it
     in your ``Doxyfile-mcss`` override.
+-   The :ini:`SHOW_NAMESPACES = NO` Doxyfile option is not supported as the
+    theme provides a much more flexible configuration of what's shown in the
+    top navbar. See `Navbar links`_ for more information.
 
 `Not yet implemented features`_
 -------------------------------