update readme

README.md

@@ -34,6 +34,17 @@ datasets:
 
 This is a sentence-transformers model: It maps sentences & paragraphs to a N dimensional dense vector space and can be used for tasks like clustering or semantic search. 
 
+The model conversion was made with [onnx-convert](https://github.com/nixiesearch/onnx-convert) tool with the following parameters:
+
+```shell
+python convert.sh --model_id intfloat/e5-base-v2 --quantize QInt8 --optimize 2
+```
+
+There are two versions of model available:
+
+* `model.onnx` - Float32 version, with optimize=2
+* `model_opt2_QInt8.onnx` - QInt8 quantized version, with optimize=2
+
 ## License
 
 Apache 2.0