# \`add\_prefix\_space=True\` option for the BPE tokenizer

**URL:** </static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fadd-prefix-space-true-option-for-the-bpe-tokenizer%2F1633%3E%5C
**Category:** 🤗Transformers\
**Created:** [October 19, 2020, 7:21pm UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fadd-prefix-space-true-option-for-the-bpe-tokenizer%2F1633 "2020-10-19T19:21:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![h56cho](https://avatars.discourse-cdn.com/v4/letter/h/c2a13f/32.png) [@h56cho](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Fu%2Fh56cho)%5C
**Post date:** [October 19, 2020, 7:21pm UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fadd-prefix-space-true-option-for-the-bpe-tokenizer%2F1633%2F1 "2020-10-19T19:21:37Z")

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Hello,  
I understand that when I add the `add_prefix_space=True` option in the BPE tokenizer statement, the tokenizer will add a space in the beginning of every sequence.

Is there some specific advantages of using the `add_prefix_space=True` option for BPE tokenizer (compared to when I don’t use the option)? All my sequences start without a space in the beginning.

Thanks,