diff --git a/actix-web/src/server.rs b/actix-web/src/server.rs
index 4fbeb0186..1ea4de4ca 100644
--- a/actix-web/src/server.rs
+++ b/actix-web/src/server.rs
@@ -193,7 +193,7 @@ where
     ///
     /// One thread pool is set up **per worker**; not shared across workers.
     ///
-    /// By default set to 512 divided by the number of workers.
+    /// By default, set to 512 divided by [available parallelism](std::thread::available_parallelism()).
     pub fn worker_max_blocking_threads(mut self, num: usize) -> Self {
         self.builder = self.builder.worker_max_blocking_threads(num);
         self