diff --git a/doc/doxygen.conf b/doc/doxygen.conf
index f0009526c6f9fcb8a61ae84916690a62190e32c6..29dd647045c69da17bfd41a11bd4d047216b2583 100644
--- a/doc/doxygen.conf
+++ b/doc/doxygen.conf
@@ -757,7 +757,8 @@ WARN_LOGFILE           =
 
 INPUT                  = ../doc/main.dox \
                          ../src \
-                         ../include/core
+                         ../include/core \
+                         conf/core/internal
 
 # 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