updated docs

README.md

@@ -482,6 +482,27 @@ holmes ask "what pods are unhealthy and why?" --model=gemini/<MODEL_NAME>
 
 Be sure to replace `MODEL_NAME` with a model you have access to - e.g., `gemini-pro`,`gemini/gemini-1.5-flash`, etc.
 
+</details>
+<details>
+<summary>Vertex AI Gemini</summary>
+
+To use Vertex AI with Gemini models, set the following environment variables:
+
+```bash
+export VERTEXAI_PROJECT="your-project-id"
+export VERTEXAI_LOCATION="us-central1" 
+export GOOGLE_APPLICATION_CREDENTIALS="path/to/your/service_account_key.json"
+```
+
+Once the environment variables are set, you can run the following command to interact with Vertex AI Gemini models:
+
+```bash
+poetry run python holmes.py ask "what pods are unhealthy and why?" --model "vertex_ai/<MODEL_NAME>"
+```
+
+Be sure to replace `MODEL_NAME` with a model you have access to - e.g., `gemini-pro`,`gemini-2.0-flash-exp`, etc.
+Ensure you have the correct project, location, and credentials for accessing the desired Vertex AI model.
+
 </details>
 <details>
 <summary>Using other OpenAI-compatible models</summary>