diff --git a/README.md b/README.md
index 9bbd701fc..c8c48e888 100644
--- a/README.md
+++ b/README.md
@@ -150,9 +150,26 @@ You can follow these steps to generate a PageIndex tree from a PDF document.
 ### 1. Install dependencies
 
 ```bash
+python3 -m venv .venv
+source .venv/bin/activate
 pip3 install --upgrade -r requirements.txt
 ```
 
+On Windows PowerShell:
+
+```powershell
+py -m venv .venv
+.\.venv\Scripts\Activate.ps1
+pip install --upgrade -r requirements.txt
+```
+
+If PowerShell blocks `Activate.ps1`, allow scripts for the current shell session and retry:
+
+```powershell
+Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass
+.\.venv\Scripts\Activate.ps1
+```
+
 ### 2. Set your LLM API key
 
 Create a `.env` file in the root directory with your LLM API key. Multi-LLM is supported via [LiteLLM](https://docs.litellm.ai/docs/providers):
@@ -161,6 +178,18 @@ Create a `.env` file in the root directory with your LLM API key. Multi-LLM is s
 OPENAI_API_KEY=your_openai_key_here
 ```
 
+For non-OpenAI providers, set the provider-specific key required by LiteLLM and pass the matching model name:
+
+```bash
+DASHSCOPE_API_KEY=your_dashscope_key_here
+```
+
+```bash
+python3 run_pageindex.py --pdf_path /path/to/your/document.pdf --model dashscope/qwen-plus
+```
+
+Use the model prefix and environment variable documented by your LiteLLM provider, such as `anthropic/...`, `gemini/...`, `deepseek/...`, or `dashscope/...`.
+
 ### 3. Generate PageIndex structure for your PDF
 
 ```bash