diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs
index 4341b642999..9ca75979b99 100644
--- a/tokio/src/sync/watch.rs
+++ b/tokio/src/sync/watch.rs
@@ -707,7 +707,7 @@ impl<T> Sender<T> {
     /// Modifies the watched value **unconditionally** in-place,
     /// notifying all receivers.
     ///
-    /// This can useful for modifying the watched value, without
+    /// This can be useful for modifying the watched value, without
     /// having to allocate a new instance. Additionally, this
     /// method permits sending values even when there are no receivers.
     ///
@@ -747,7 +747,7 @@ impl<T> Sender<T> {
     /// Modifies the watched value **conditionally** in-place,
     /// notifying all receivers only if modified.
     ///
-    /// This can useful for modifying the watched value, without
+    /// This can be useful for modifying the watched value, without
     /// having to allocate a new instance. Additionally, this
     /// method permits sending values even when there are no receivers.
     ///