diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs
index 82c21709459..ea8b3939f46 100644
--- a/tokio/src/time/interval.rs
+++ b/tokio/src/time/interval.rs
@@ -423,6 +423,7 @@ impl Interval {
     ///     let mut interval = time::interval(Duration::from_millis(10));
     ///
     ///     interval.tick().await;
+    ///     // approximately 0ms have elapsed. The first tick completes immediately.
     ///     interval.tick().await;
     ///     interval.tick().await;
     ///