# NotebookLM prompt: teach-back check

Source: https://nlmexporter.com/guides/prompts/teach-back-check-prompt  
Section: Prompts  
Last verified: November 2026  
Plan: Free

Use it after studying: you explain, and NotebookLM checks you against the sources. Paste the prompt below into the NotebookLM (Gemini Notebook) chat and replace the parts in square brackets. It tells NotebookLM to answer only from your sources, cite them and flag what they do not cover.

## Quick facts

| Item | Detail |
| --- | --- |
| Works in | NotebookLM / Gemini Notebook chat, and the customise box of Studio items |
| Sources needed | The material you just studied. |
| Cost | Free to copy. Saving it in the extension is free for up to 10 plain prompts. |

## The prompt

```text
I will explain [TOPIC] in my own words below. Compare my explanation with the sources.
Tell me: what I got right; what is wrong, with the correct version and its source; what I left out that matters.
Do not rewrite my explanation. Ask me one follow-up question at a time.

My explanation: [PASTE HERE]

Use only the sources in this notebook. Cite the source for every claim. If the sources do not cover something, say "not covered in the sources" instead of filling the gap.
```

## How to use it

1. Open the notebook and tick only the sources this question is about.
2. Paste the prompt into the chat and replace every part in [SQUARE BRACKETS].
3. Open two or three citations in the answer to confirm they say what the answer claims.
4. Save the answer as a note, then keep it: [Export the conversation to Markdown](https://nlmexporter.com/guides/export/chat-history-to-markdown).

## Adapt it

- Ask it to grade strictly, as an examiner would.
- Repeat a week later without looking at your notes.

> NotebookLM can misread or over-generalise a source. A prompt reduces that; it does not remove it. Check cited passages before you rely on an answer.

## Frequently asked questions

### What should be in the notebook before I use the teach-back check prompt?

The material you just studied.

### Why does the prompt ask NotebookLM to say what is not covered?

Because a grounded tool is most useful when it shows the edges of your sources. An explicit instruction to flag gaps reduces confident answers that the sources do not support.

### Does this prompt work in Gemini Notebook?

Yes. Gemini Notebook is the new name of NotebookLM since July 16, 2026. The chat works the same way: it answers from the sources you select.

## Related guides

- [Export NotebookLM chat history to Markdown](https://nlmexporter.com/guides/export/chat-history-to-markdown)
- [NotebookLM prompt: study guide from your sources](https://nlmexporter.com/guides/prompts/study-guide-from-sources-prompt)
- [NotebookLM prompt: exam practice questions](https://nlmexporter.com/guides/prompts/exam-practice-questions-prompt)
- [NotebookLM prompt: explain a difficult concept](https://nlmexporter.com/guides/prompts/concept-explainer-prompt)
- [NotebookLM prompt: better flashcards](https://nlmexporter.com/guides/prompts/flashcard-generation-prompt)
- [NotebookLM prompt: study plan for the time you have](https://nlmexporter.com/guides/prompts/study-plan-by-time-budget-prompt)