Update README

Author: thomasantony

README.md

@@ -32,6 +32,8 @@ llamacpp-quantize ./models/7B/
 llamacpp-cli
 ```
 
+**Note that running `llamacpp-convert` requires `torch`, `sentencepiece` and `numpy` to be installed. These packages are not installed by default when your install `llamacpp`.**
+
 ## Command line interface
 
 The package installs the command line entry point `llamacpp-cli` that points to `llamacpp/cli.py` and should provide about the same functionality as the `main` program in the original C++ repository. There is also an experimental `llamacpp-chat` that is supposed to bring up a chat interface but this is not working correctly yet.