Update README.md

This is an addition to the README to help users who will encounter this problem
erksch · Apr 25, 2020 · 781399b · 781399b
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@@ -40,3 +40,10 @@ Now, you can open the `index.html` file in the browser or call
 yarn serve
 ```
 to start a small python server on port 8000 that serves the html file.
+
+## Known Issues
+
+If you had a GPU with a small RAM, misalignment between the LIDARs can happen. In this case, please try to run websocket using cpu
+```
+CUDA_VISIBLE_DEVICES="-1" python websocket.py --segments-dir path/to/segments
+```