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diff --git a/TODO.md b/TODO.md
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+++ b/TODO.md
@@ -1,5 +1,10 @@
 # Site TODO
 
+## Notes
+
+- use `zf` to fold sections
+- use `zc` to expand tem
+
 ## general
 - replace `<img>` in old posts with `{{< figure >}}` (partial work
   done on stuff `>= 2019`)