---
title: Mark as seen
slug: mark-as-seen
summary: After you read what changed, press Seen (or Cmd/Ctrl+Shift+D) to make the version on screen the new seen version. Tabs whose file changed since then show a ~ sign.
---

# Mark as seen

Once you have read what an agent changed, mark the file **seen**. The version on your screen becomes the file's new [seen version](seen-snapshots.md), the change marks clear, and next time [Changes](changes-view.md) shows only what changed after that.

## Mark a file seen

Turn on Changes first (**Cmd+D** on a Mac, **Ctrl+D** on Windows and Linux). Then:

- Press **Cmd+Shift+D** on a Mac, or **Ctrl+Shift+D** on Windows and Linux.
- Or click **Seen** in the status strip, next to **Changes**. It shows only while Changes is on.
- Or open the command palette (**Cmd+Shift+P** or **Ctrl+Shift+P**) and pick **Mark as seen**.

Skimmark says **Marked as seen.** and the status strip says **No changes since last seen**. When Changes is off, the shortcut does nothing in Skimmark.

Skimmark saves exactly the version you were looking at. If the file changed on disk a moment before you pressed Seen, and the page had not caught up yet, Skimmark does not save the newer version you have not seen. It says **The file changed. Not marked as seen.** and shows the new version; read it, then press Seen again.

If the file is over 20 MB, or the seen version cannot be saved, Skimmark says **Could not mark as seen** with the reason, and the old seen version stays.

## The ~ sign on tabs

A tab shows a **~** sign after the file name when the file on disk is different from its seen version, for example after an agent rewrote it. This works for every open tab, not only the one you are looking at. Marking the file seen removes the sign. A screen reader reads such a tab as "notes.md, changed since last seen".

## What does not mark a file seen

Only Seen does. Opening, reading, scrolling, turning Changes off, closing the tab, and quitting Skimmark all leave the seen version as it was.