diff --git a/04-tool-use/README.md b/04-tool-use/README.md
index 966b197fb..358680e82 100644
--- a/04-tool-use/README.md
+++ b/04-tool-use/README.md
@@ -262,7 +262,7 @@ The tools available in Azure AI Agent Service can be divided into two categories
 2. Action Tools:
     - <a href="https://learn.microsoft.com/azure/ai-services/agents/how-to/tools/function-calling?tabs=python&pivots=overview" target="_blank">Function Calling</a>
     - <a href="https://learn.microsoft.com/azure/ai-services/agents/how-to/tools/code-interpreter?tabs=python&pivots=overview" target="_blank">Code Interpreter</a>
-    - <a href="https://learn.microsoft.com/azure/ai-services/agents/how-to/tools/openapi-spec?tabs=python&pivots=overview" target="_blank">OpenAI defined tools</a>
+    - <a href="https://learn.microsoft.com/azure/ai-services/agents/how-to/tools/openapi-spec?tabs=python&pivots=overview" target="_blank">OpenAPI defined tools</a>
     - <a href="https://learn.microsoft.com/azure/ai-services/agents/how-to/tools/azure-functions?pivots=overview" target="_blank">Azure Functions</a>
 
 The Agent Service allows us to be able to use these tools together as a `toolset`. It also utilizes `threads` which keep track of the history of messages from a particular conversation.