--- title: I added a single line to my ChatGPT prompts, and the... description: Adding a single instruction to ChatGPT prompts can prevent the model from confidently filling in missing details with assumptions. The technique involves... canonical: https://daily.dev/posts/i-added-a-single-line-to-my-chatgpt-prompts-and-the-difference-was-immediate-qx99s3mrb twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: I added a single line to my ChatGPT prompts, and the difference was immediate | daily.dev og:description: Adding a single instruction to ChatGPT prompts can prevent the model from confidently filling in missing details with assumptions. The technique involves... og:url: https://daily.dev/posts/i-added-a-single-line-to-my-chatgpt-prompts-and-the-difference-was-immediate-qx99s3mrb og:image: https://api.daily.dev/og/posts/QX99s3mRb.png og:image:alt: I added a single line to my ChatGPT 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 a single line to my ChatGPT prompts, and the difference was immediate **[XDA Developers](https://daily.dev/sources/xda-developers)** · 5 min read · 1 upvotes · 0 comments ## Summary Adding a single instruction to ChatGPT prompts can prevent the model from confidently filling in missing details with assumptions. The technique involves appending: 'Before you answer, assess the uncertainty of your response. If it's greater than 0.1, ask me clarifying questions until the uncertainty is 0.1 or lower.' This forces ChatGPT to pause, evaluate how much information is missing, and ask targeted questions before generating a response. Tested with a vague Japan vacation prompt, ChatGPT asked seven clarifying questions instead of producing a generic itinerary. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I get ChatGPT to ask clarifying questions instead of guessing at missing details in my prompt? Add a line telling ChatGPT to assess its own uncertainty and ask clarifying questions if that uncertainty is above a threshold, for example: 'Before you answer, assess the uncertainty of your response. If it's greater than 0.1, ask me clarifying questions until the uncertainty is 0.1 or lower.' Testing this on a vague 'plan a 5-day vacation to Japan' prompt made ChatGPT estimate roughly 0.5 uncertainty and ask seven clarifying questions (dates, departure city, budget, pace, food needs) before producing an itinerary, instead of silently filling gaps with generic assumptions. _daily.dev surfaces prompt techniques like this for developers building more reliable ChatGPT workflows._ ## Similar posts on daily.dev - [I added one line to my Claude prompts, and the improvement was immediate](https://daily.dev/posts/i-added-one-line-to-my-claude-prompts-and-the-improvement-was-immediate-p0xv0aits) · XDA Developers · 0 upvotes · 0 comments - [3 Proven Methods to Get the Most Out of ChatGPT-5](https://daily.dev/posts/3-proven-methods-to-get-the-most-out-of-chatgpt-5-r0getur8u) · UX Planet · 7 upvotes · 0 comments - [I added one line to my Claude Code prompts, and the difference was night and day](https://daily.dev/posts/i-added-one-line-to-my-claude-code-prompts-and-the-difference-was-night-and-day-rveqxr0nq) · XDA Developers · 1 upvotes · 0 comments - [You’re Using ChatGPT Wrong. Here’s What Actually Works.](https://daily.dev/posts/you-re-using-chatgpt-wrong-here-s-what-actually-works--p1jd7g7wu) · Faun · 4 upvotes · 1 comments --- Tags: [#llm](https://daily.dev/tags/llm), [#chatgpt](https://daily.dev/tags/chatgpt), [#prompt-engineering](https://daily.dev/tags/prompt-engineering) [View this post on daily.dev](https://daily.dev/posts/i-added-a-single-line-to-my-chatgpt-prompts-and-the-difference-was-immediate-qx99s3mrb) ```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 a single line to my ChatGPT prompts, and the difference was immediate","url":"https://daily.dev/posts/i-added-a-single-line-to-my-chatgpt-prompts-and-the-difference-was-immediate-qx99s3mrb","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/i-added-a-single-line-to-my-chatgpt-prompts-and-the-difference-was-immediate-qx99s3mrb"},"datePublished":"2026-08-09T19:33:07.117Z","dateModified":"2026-09-14T08:56:02.967Z","description":"Adding a single instruction to ChatGPT prompts can prevent the model from confidently filling in missing details with assumptions. 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If it's greater than 0.1, ask me clarifying questions until the uncertainty is 0.1 or lower.' Testing this on a vague 'plan a 5-day vacation to Japan' prompt made ChatGPT estimate roughly 0.5 uncertainty and ask seven clarifying questions (dates, departure city, budget, pace, food needs) before producing an itinerary, instead of silently filling gaps with generic assumptions. daily.dev surfaces prompt techniques like this for developers building more reliable ChatGPT workflows."}}]} ```