diff --git a/TODO.md b/TODO.md
index 3731cefeb..ddf2a87c5 100644
--- a/TODO.md
+++ b/TODO.md
@@ -35,6 +35,7 @@
 - [x] ctrl-c support
 - [x] operator overflow
 - [x] Support for `$in`
+- [ ] config system
 - [ ] shells
 - [ ] plugins
 - [ ] dataframes