> For the complete documentation index, see [llms.txt](https://docs.aichatone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.aichatone.com/product-guides/set-up-system-message/initial-system-instruction.md).
# Initial system instruction
To set up initial system instruction on AIChatOne(a.k.a system message on ChatGPT):
* Go to Model Settings
* Navigate the Initial System Instruction section
* Input your instruction to guide the chat model behavior during the conversation.
## What is AIChatOne’s initial system instruction?
AIChatOne’s initial system instruction is the first message provided by you to the model in order to give the AI assistant a general rule or guideline to follow in the conversation. This could include instructions about the tone, style, or context in which the model should respond.
> For example, if the system instruction is to "Write in a style of Shakespeare", ChatGPT would provide responses in the style of this greatest writer for any of your inquiries.
The initial system instruction plays a crucial role in shaping the AI's responses and the overall flow of the chat.
## Formula to craft a good ChatGPT system instruction
While there is no one-size-fits-all formula, here are some guidelines to help you create an effective instruction:
1. Be clear about your purpose: clearly define the desired purpose and the intended outcomes for ChatGPT.
2. Provide context: offer specific and relevant background information to help ChatGPT understand the context
> Please note that the effectiveness of this instruction may depend on different factors. You don’t need to cover all of 5 above best practices in your initial instruction, it's essential to iterate many experiments and adapt the instruction to suit your goals.