Update README

README.md

@@ -40,4 +40,10 @@ sudo docker run -d --gpus=all -p 7860:7860 whisper-webui:1
 Leave out "--gpus=all" if you don't have access to a GPU with enough memory, and are fine with running it on the CPU only:
 ```
 sudo docker run -d -p 7860:7860 whisper-webui:1
-```
+```
+
+## Caching
+
+Note that the models themselves are currently not included in the Docker images, and will be downloaded on the demand.
+To avoid this, bind the directory /root/.cache/whisper to some directory on the host, where you can (optionally) 
+prepopulate the directory with the different Whisper models.