diff --git a/content/notes/05-filesystems.md b/content/notes/05-filesystems.md
index 84fd2349c..2b0accdd9 100644
--- a/content/notes/05-filesystems.md
+++ b/content/notes/05-filesystems.md
@@ -28,8 +28,9 @@ UNIX file system
 - tree ![](https://i.imgur.com/9iDILn6.png)
 - descriptions
 - implementation
-
+	- inode ⇒ data structure documenting data about a file
 structure of directory
+- current working DIR is always in memory
 
 soft vs hard links
 - hard link must always point to data - to delete a file with hard links you must also delete all the hard links