diff --git a/doc/NOTES.md b/doc/NOTES.md
index 8f83d44..fc32cff 100644
--- a/doc/NOTES.md
+++ b/doc/NOTES.md
@@ -33,3 +33,4 @@
 ## TODO
 - theme: `load` vs. `__load` vs. `load_keywords`
 - themes: use colors to improve theme readability
+- brightness: read from CLI tools