From 6b37ce0cc055fc3101e7f59e07a6517ebf6e599b Mon Sep 17 00:00:00 2001
From: thomasw21 <24695242+thomasw21@users.noreply.github.com>
Date: Thu, 16 Mar 2023 12:30:00 +0100
Subject: [PATCH] Document how to tune the number of threads one can use in
 hf_transfer

---
 src/lib.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/lib.rs b/src/lib.rs
index 6aad899..7cef5cf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,6 +14,7 @@ use tokio::time::sleep;
 
 /// parallel_failures:  Number of maximum failures of different chunks in parallel (cannot exceed max_files)
 /// max_retries: Number of maximum attempts per chunk. (Retries are exponentially backed off + jitter)
+/// number of threads can be tuned by environment variable `TOKIO_WORKER_THREADS` as documented in https://docs.rs/tokio/latest/tokio/runtime/struct.Builder.html#method.worker_threads
 #[pyfunction]
 #[pyo3(signature = (url, filename, max_files, chunk_size, parallel_failures=0, max_retries=0))]
 fn download(