diff --git a/audacity.dox.in b/audacity.dox.in
index a5588f096..4cab7247e 100644
--- a/audacity.dox.in
+++ b/audacity.dox.in
@@ -790,7 +790,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = src/ \
+INPUT                  = src/ libraries/ modules/ \
                          dox2-src/ \
                          include/ \
                          lib-src/FileDialog/