# Use your KBAI source URL in a button
When your bot [retrieves an answer](https://docs.chatlayer.ai/navigation/build-your-kbai-flow#retrieve-the-answer) from your knowledge base, this answer exists within a variable that also contains a link to the source of this answer. This source is either a PDF name or link to an URL.
In the case of an URL source, this URL link can typically be used as a button within the bot conversation.
Example of a knowledge base source URL used within a conversation as a button.
To use the KBAI URL within an answer:
1. Create your **Text message**.
2. Add a button that displays the following variable: `{knowledgebase.contentUrl}`. Your bot message should look similar to this one:
Your final result should be similar to this:
Example of a knowledge base source URL used as a button.
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# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://docs.chatlayer.ai/navigation/knowledge-base-ai/use-your-kbai-source-url-in-a-button.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
