Update README.md

README.md

@@ -37,7 +37,8 @@ We strongly recommend following the same usage as the original ColBERT to use th
 To use this model, you will need to install the **latest version** of the ColBERT repository (if not the latest version the ColBERT code may not support models that use the custom code and cause an assertion error):
 
 ```bash
-pip install git+https://github.com/stanford-futuredata/ColBERT.git torch faiss-gpu
+pip install git+https://github.com/stanford-futuredata/ColBERT.git torch
+conda install -c conda-forge faiss-gpu  # use conda to install the latest version faiss
 ```
 
 ### Indexing