update README

README.md

@@ -101,6 +101,7 @@ Inference cost for CNV_2W2A.onnx
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+You can use the `--cost-breakdown` option to generate a more detailed report that covers per-node (by name) and per-op-type information.
 You can read more about the BOPS metric in [this paper](https://www.frontiersin.org/articles/10.3389/frai.2021.676564/full), Section 4.2 Bit Operations.
 
 ### Convert between different quantization representations