diff --git a/.gitignore b/.gitignore
index 288dffc691a193e55b9ce6f7b1e06f286ec32c82..41e82c7a7448e24f0a58e1c3d27adf6025fb9ef2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,4 @@
 src/include/66/config.h
 /doc/*/
 TODO
+hidden/