Minor

README.md

@@ -26,6 +26,11 @@ computes precision, recall and F1 scores.
 
 ## How to Use
 
+Before using this metric, you need to install the dependencies - 
+```bash
+pip install -U sentence-transformers scikit-learn nltk
+```
+
 Sem-F1 takes 2 mandatory arguments:  
 
 - `predictions` - List of predictions. Format varies based on `tokenize_sentences` and `multi_references` flags.