diff --git a/docs/Doxygen.conf b/docs/Doxygen.conf
index 79eccfde16..13a6071272 100644
--- a/docs/Doxygen.conf
+++ b/docs/Doxygen.conf
@@ -568,7 +568,7 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  =../src
+INPUT                  =../src ../libs/libteletone
 
 # 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