diff --git a/doc/NOTES.md b/doc/NOTES.md
index 621e16a..e05cf82 100644
--- a/doc/NOTES.md
+++ b/doc/NOTES.md
@@ -23,3 +23,6 @@
 - theme.exclude (battery)
 - use add_widget() instead of core.widget.Widget()
 - use widget index for bumblebee-ctl as alternative (??)
+
+# documentation
+Add info about error widget and events for error logging