Update docs/src/frequently_asked_questions.md

docs/src/frequently_asked_questions.md

@@ -84,7 +84,11 @@ If you want to avoid this error, you have two options:
    ```
 
 ## Getting the error "429 Too Many Requests"?
-This error has been reported, along with the message "You exceeded your current quota, please check your plan and billing details. For more information on this error, read the docs: https://platform.openai.com/docs/guides/error-codes/api-errors". It was concluded that this was because the account in question was not funded, which meant that the "current quota" was zero. Unlike using [ChatGPT online](chat.openai.com/), it is not free to access ChatGPT via the OpenAI API. Note however that each request is cheap, and that it might make sense to pay a few cents or dollars for the online service.
+Assuming you have not just sent hundreds of requests, this error might be related to insufficient "credits" in your account balance.
+
+See the error message. If it says "You exceeded your current quota, please check your plan and billing details. For more information on this error, read the docs: https://platform.openai.com/docs/guides/error-codes/api-errors", you'll need to re-charge your account balance. Visit [Billing overview](https://platform.openai.com/settings/organization/billing/overview).
+
+Please note that, unlike ChatGPT, OpenAI API is NOT free. However, individual requests are extremely cheap (eg, tenth of a cent), so if you charge $5, it might last you up to hundreds of requests (depending on the models and prompts).
 
 ## Setting OpenAI Spending Limits