Update openai-functions.md

Signed-off-by: Ettore Di Giacinto <[email protected]>

docs/content/docs/features/openai-functions.md

@@ -144,6 +144,15 @@ curl http://localhost:8080/v1/chat/completions -H "Content-Type: application/jso
    }'
 ```
 
+Grammars and function tools can be used as well in conjunction with vision APIs:
+
+```bash
+ curl http://localhost:8080/v1/chat/completions -H "Content-Type: application/json" -d '{
+     "model": "llava", "grammar": "root ::= (\"yes\" | \"no\")",
+     "messages": [{"role": "user", "content": [{"type":"text", "text": "Is there some grass in the image?"}, {"type": "image_url", "image_url": {"url": "https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Gfp-wisconsin-madison-the-nature-boardwalk.jpg/2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg" }}], "temperature": 0.9}]}'
+```
+
+
 ## 💡 Examples
 
 A full e2e example with `docker-compose` is available [here](https://github.com/go-skynet/LocalAI/tree/master/examples/functions).