update readme

README.md

@@ -19,7 +19,7 @@ We show performance of fine-tuning BERT and DictBERT on the GLEU benchmarks task
 
 HF: huggingface checkpoint for BERT-base uncased
 
-If no dictionary if provided during fine-tuning, DictBERT can still achieve better performance than BERT. 
+If no dictionary is provided during fine-tuning (i.e., the same as BERT fine-tuning), DictBERT can still achieve better performance than BERT. 
 
 | | MNLI | QNLI | QQP | SST-2 | CoLA | MRPC | RTE | STS-B | Average |
 |:----:|:-----------:|:----:|:----:|:-----:|:----:|:-----:|:----:|:----:|:-------:|