how to modify the maxtokens of custom segment

[rudadasir]

dify/api/core/rag/index_processor/index_processor_base.py
dify/api/core/indexing_runner.py

when i modify the files above
if segmentation["max_tokens"] < 50 or segmentation["max_tokens"] > 1000:
raise ValueError("Custom segment length should be between 50 and 1000.")”

1000-->2000，nothing changes

so,how can i custom the maxtokens of segments to 2000?