Update README.md

Co-authored-by: Datong Sun <[email protected]>
Kong · Nov 22, 2024 · 93a4ddd · 93a4ddd
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@@ -235,6 +235,7 @@ Return all keys `>= start` and starts with `prefix`. If `db` is omitted,
 it defaults to `"_default"`.
 
 If `page_size` is specified, up to `page_size` results will be returned.
+`page_size` can not be less than `1`.
 
 The return value of this function is a table `res` where `res[1].key` and `res[1].value`
 corresponds to the first key and value, `res[2].key` and `res[2].value` corresponds to the