Update README.md

README.md

@@ -22,7 +22,8 @@ dataset_size: 26.1 GB
 This dataset combines [wikipedia20220301.en](https://huggingface.co/datasets/wikipedia) and [bookcorpusopen](https://huggingface.co/datasets/bookcorpusopen),
 and splits the data into smaller chunks, of size ~820 chars 
 (such that each item will be at least ~128 tokens for the average tokenizer). 
-The order of the items has been shuffled.
+The order of the items in this dataset has been shuffled,
+meaning it's faster to iterate over than using `dataset.shuffle`.
 The logic only splits on spaces, so the chunks are likely to be slightly larger than 820 chars. 
 The dataset has been normalized into lower case, with accents and non-english characters removed.
 Items with less than 200 chars or more than 1000 chars have been removed.