diff --git a/Doxyfile b/Doxyfile
index ac741f1ee6..934897d58e 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -574,7 +574,7 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  = sw/airborne
+INPUT                  = sw/airborne sw/airborne/math
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is