--- title: I added one line to my NotebookLM prompts, and the... description: NotebookLM has been drifting from its original source-grounded behavior since the Gemini rebrand, now offering unsolicited web searches and suggestions. A... canonical: https://daily.dev/posts/i-added-one-line-to-my-notebooklm-prompts-and-the-difference-was-immediate-bdgm7m7mr twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: I added one line to my NotebookLM prompts, and the difference was immediate | daily.dev og:description: NotebookLM has been drifting from its original source-grounded behavior since the Gemini rebrand, now offering unsolicited web searches and suggestions. A... og:url: https://daily.dev/posts/i-added-one-line-to-my-notebooklm-prompts-and-the-difference-was-immediate-bdgm7m7mr og:image: https://api.daily.dev/og/posts/BdGM7M7MR.png og:image:alt: I added one line to my NotebookLM prompts, and the difference was immediate og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # I added one line to my NotebookLM prompts, and the difference was immediate **[XDA Developers](https://daily.dev/sources/xda-developers)** · 6 min read · 0 upvotes · 0 comments ## Summary NotebookLM has been drifting from its original source-grounded behavior since the Gemini rebrand, now offering unsolicited web searches and suggestions. A single appended sentence — 'Answer only from sources that support this, name them, flag which ones don't cover it, and don't offer to do anything else.' — restores the tool's original restraint. The author tested several prompt variations to arrive at this wording, finding it keeps NotebookLM strictly within uploaded documents, forces source attribution, and eliminates unprompted offers. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Most AI note apps want to replace your brain, but NotebookLM works better alongside it](https://daily.dev/posts/most-ai-note-apps-want-to-replace-your-brain-but-notebooklm-works-better-alongside-it-8zznfvgva) · XDA Developers · 0 upvotes · 0 comments - [Google recommends these 7 NotebookLM prompts, and they showed me what I was missing](https://daily.dev/posts/google-recommends-these-7-notebooklm-prompts-and-they-showed-me-what-i-was-missing-2upulabkn) · XDA Developers · 0 upvotes · 0 comments - [NotebookLM has stopped feeling like NotebookLM, and I'm still deciding if that's a win](https://daily.dev/posts/notebooklm-has-stopped-feeling-like-notebooklm-and-i-m-still-deciding-if-that-s-a-win-swu1a3cpt) · XDA Developers · 1 upvotes · 1 comments --- Tags: [#ai](https://daily.dev/tags/ai), [#prompt-engineering](https://daily.dev/tags/prompt-engineering), [#google-gemini](https://daily.dev/tags/google-gemini), [#notebooklm](https://daily.dev/tags/notebooklm) [View this post on daily.dev](https://daily.dev/posts/i-added-one-line-to-my-notebooklm-prompts-and-the-difference-was-immediate-bdgm7m7mr) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"I added one line to my NotebookLM prompts, and the difference was immediate","url":"https://daily.dev/posts/i-added-one-line-to-my-notebooklm-prompts-and-the-difference-was-immediate-bdgm7m7mr","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/i-added-one-line-to-my-notebooklm-prompts-and-the-difference-was-immediate-bdgm7m7mr"},"datePublished":"2026-07-19T21:01:16.806Z","dateModified":"2026-07-19T21:02:13.878Z","description":"NotebookLM has been drifting from its original source-grounded behavior since the Gemini rebrand, now offering unsolicited web searches and suggestions. 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