Add a note about "Atomic"
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drwxr-xr-x   ..
drwxr-xr-x - covers
drwxr-xr-x - currently_reading
-rw-r--r-- 461 index.md
drwxr-xr-x - plans
drwxr-xr-x - reviews
drwxr-xr-x - will_never_read