diff --git a/tracing/src/span.rs b/tracing/src/span.rs
index 6ca7f886aa..f379c76e32 100644
--- a/tracing/src/span.rs
+++ b/tracing/src/span.rs
@@ -605,9 +605,13 @@ impl Span {
     /// async fn my_async_function() {
     ///     let span = info_span!("my_async_function");
     ///
-    ///     // THIS WILL RESULT IN INCORRECT TRACES
+    ///     // WARNING: This span will remain entered until this
+    ///     // guard is dropped...
     ///     let _enter = span.enter();
-    ///     some_other_async_function().await;
+    ///     // ...but the `await` keyword may yield, causing the
+    ///     // runtime to switch to another task, while remaining in
+    ///     // this span!
+    ///     some_other_async_function().await
     ///
     ///     // ...
     /// }