# 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.
