Update bing-grounding.md

Author: lindazqli

articles/ai-services/agents/how-to/tools/bing-grounding.md

@@ -21,7 +21,7 @@ ms.custom: azure-ai-agents
 
 You can ask questions such as "*what is the top news today*" or "*what is the recent update in the retail industry in the US?*", which require real-time public data.
 
-Developers and end users don't have access to raw content returned from Grounding with Bing Search. The response, however, includes citations with links to the websites used to generate the response, and a link to the Bing query used for the search. These two *References* must be retained and displayed in the exact form provided by Microsoft, as per Grounding with Bing Search's [Use and Display Requirements](https://www.microsoft.com/en-us/bing/apis/grounding-legal#use-and-display-requirements). See the [how to display Grounding with Bing Search results](#how-to-display-grounding-with-bing-search-results) section for details.
+Developers and end users don't have access to raw content returned from Grounding with Bing Search. The model response, however, includes citations with links to the websites used to generate the response, and a link to the Bing query used for the search. You can retrieve **model response** through Thread API. These two *References* must be retained and displayed in the exact form provided by Microsoft, as per Grounding with Bing Search's [Use and Display Requirements](https://www.microsoft.com/en-us/bing/apis/grounding-legal#use-and-display-requirements). See the [how to display Grounding with Bing Search results](#how-to-display-grounding-with-bing-search-results) section for details.
 
 >[!IMPORTANT]
 > 1. Your usage of Grounding with Bing Search can incur costs. See the [pricing page](https://www.microsoft.com/bing/apis/grounding-pricing) for details.
@@ -163,6 +163,8 @@ const client = AIProjectsClient.fromConnectionString(
 ```
 
 # [REST API](#tab/rest)
+>[!IMPORTANT]
+> 1. This REST API allows developers to invoke Grounding with Bing Search tool through Azure AI Agent service, not direct calling Grounding with Bing Search API. 
 Follow the [REST API Quickstart](../../quickstart.md?pivots=rest-api) to set the right values for the environment variables `AZURE_AI_AGENTS_TOKEN` and `AZURE_AI_AGENTS_ENDPOINT`.
 
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