diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs
index 47ba18c96..93c67c5b5 100644
--- a/tokio/src/runtime/builder.rs
+++ b/tokio/src/runtime/builder.rs
@@ -770,6 +770,7 @@ impl Builder {
     /// # }
     /// ```
     #[cfg(tokio_unstable)]
+    #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))]
     pub fn on_before_task_poll<F>(&mut self, f: F) -> &mut Self
     where
         F: Fn(&TaskMeta<'_>) + Send + Sync + 'static,
@@ -813,6 +814,7 @@ impl Builder {
     /// # }
     /// ```
     #[cfg(tokio_unstable)]
+    #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))]
     pub fn on_after_task_poll<F>(&mut self, f: F) -> &mut Self
     where
         F: Fn(&TaskMeta<'_>) + Send + Sync + 'static,