diff --git a/what%27s-here.md b/what%27s-here.md
index 31fa451..58fb94f 100644
--- a/what%27s-here.md
+++ b/what%27s-here.md
@@ -21,4 +21,8 @@
 
 - `i4oled-chgrp DIR` changes the group any files inside `DIR` to `plugdev`
 - used by `bin/tablet_setup` to make the screen thingies on my tablet writeable
-- a separate script because it needs to run as root
\ No newline at end of file
+- a separate script because it needs to run as root
+
+## `nd`
+
+- looks for `flake.nix`, jumps there, execs `nix develop`, jumps back
\ No newline at end of file