fix actix-files doc about thread pool
@@ -82,8 +82,9 @@ impl Files {
/// be inaccessible. Register more specific handlers and services first.
///
/// `Files` uses a threadpool for blocking filesystem operations. By default, the pool uses a
- /// number of threads equal to 5x the number of available logical CPUs. Pool size can be changed
- /// by setting ACTIX_THREADPOOL environment variable.
+ /// max number of threads equal to `512 * HttpServer::worker`. Real time thread count are
+ /// adjusted with work load. More threads would spawn when need and threads goes idle for a
+ /// period of time would be de-spawned.
pub fn new<T: Into<PathBuf>>(mount_path: &str, serve_from: T) -> Files {
let orig_dir = serve_from.into();
let dir = match orig_dir.canonicalize() {
