diff --git a/doc/Doxygen/Doxyfile b/doc/Doxygen/Doxyfile
index d4a21ca45d..526ee69f49 100644
--- a/doc/Doxygen/Doxyfile
+++ b/doc/Doxygen/Doxyfile
@@ -768,7 +768,9 @@ WARN_LOGFILE           =
 #INPUT                  = $(WM_PROJECT_DIR)/src/OpenFOAM/global
 INPUT                  = $(WM_PROJECT_DIR)/src \
                          $(WM_PROJECT_DIR)/applications/utilities \
-                         $(WM_PROJECT_DIR)/applications/solvers
+                         $(WM_PROJECT_DIR)/applications/modules \
+                         $(WM_PROJECT_DIR)/applications/solvers \
+                         $(WM_PROJECT_DIR)/applications/legacy
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses