From 30bc89f36a0310eb5c9c710f0544577b3688fd77 Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Sat, 9 Sep 2023 10:32:01 +0200
Subject: lsof: add note about checking mnt points

---
 src/monitor/lsof.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/monitor/lsof.md b/src/monitor/lsof.md
index 7effd39..562c8fc 100644
--- a/src/monitor/lsof.md
+++ b/src/monitor/lsof.md
@@ -65,3 +65,10 @@ lsof -a -u $USER -i :1234
 ```markdown
 lsof -i 4TCP -s TCP:ESTABLISHED
 ```
+## List open files in a mounted directory.
+This may help to find which processes keep devices busy when trying to unmount
+and the device is currently busy.
+```markdown
+# Assuming /proc is a mount point.
+lsof /proc
+```
-- 
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