Update deep-research.md

Author: sanjeev3

articles/ai-foundry/agents/how-to/tools/deep-research.md

@@ -18,6 +18,9 @@ The Deep Research model in the Azure AI Foundry Agent Service enables you to use
 > * The Deep Research tool uses **Grounding with Bing Search**. Be sure to read and understand all stipulations of its use, including potential [costs](https://www.microsoft.com/bing/apis/grounding-pricing) that can be incurred, the [terms of use](https://www.microsoft.com/bing/apis/grounding-legal), and [use and display requirements](./bing-grounding.md#how-to-display-grounding-with-bing-search-results). See the [Grounding with Bing Search](./bing-grounding.md) documentation for more information.
 > * The Deep Research tool uses the Azure OpenAI `o3-deep-research` model. This model is not available in Azure OpenAi service.
 
+> [!NOTE]
+> When using Grounding with Bing Search, only the Bing search query, tool parameters, and your resource key are sent to Bing, and no end user-specific information is included. Your resource key is sent to Bing solely for billing and rate limiting purposes. 
+
 ## Usage support
 The deep research tool is a **code-only release** and available for use via the Agents Python SDK once you complete the setup steps listed in the following sections.
 |Azure AI foundry support  | Python SDK |	C# SDK | JavaScript SDK | REST API |Basic agent setup | Standard agent setup |