Add a note about modifier.idf

README.md

@@ -9,6 +9,9 @@ ONNX port of [sentence-transformers/all-MiniLM-L6-v2](https://huggingface.co/sen
 
 Here's an example of performing inference using the model with [FastEmbed](https://github.com/qdrant/fastembed).
 
+> Note:
+This model is supposed to be used with Qdrant. Vectors have to be configured with [Modifier.IDF](https://qdrant.tech/documentation/concepts/indexing/?q=modifier#idf-modifier).
+
 ```py
 from fastembed import TextEmbedding