diff --git a/Doxyfile.in b/Doxyfile.in
index d6080335f5778dd44d193554b949d129dba6e994..75c84498ed8911fe3f9f0f11fa07e34ef72623b5 100644
--- a/Doxyfile.in
+++ b/Doxyfile.in
@@ -782,6 +782,9 @@ WARN_LOGFILE           =
 # Note: If this tag is empty the current directory is searched.
 
 INPUT                  = @PROJECT_SOURCE_DIR@/README.md \
+                         @PROJECT_SOURCE_DIR@/ext/amfe/fwk/src \
+                         @PROJECT_SOURCE_DIR@/ext/amfe/tbox/src \
+                         @PROJECT_SOURCE_DIR@/ext/amfe/tboxVtk/src \
                          @PROJECT_SOURCE_DIR@/dart/src \