Update README.md

README.md

@@ -7,7 +7,7 @@ metrics:
 
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-To use our fine-tuned BioBERT model to predict whether a sentence from radiology reports makes reference to priors, run the following:
+To use our fine-tuned BioBERT model to predict whether a sentence from a radiology reports makes reference to priors, run the following:
 
 ```python
 from transformers import AutoTokenizer, AutoModelForTokenClassification