diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs
index 76b28f24e36..5de23669b82 100644
--- a/tokio/src/runtime/handle.rs
+++ b/tokio/src/runtime/handle.rs
@@ -39,6 +39,7 @@ pub struct Handle {
 ///
 /// [`Runtime::enter`]: fn@crate::runtime::Runtime::enter
 #[derive(Debug)]
+#[must_use = "Creating and dropping a guard does nothing"]
 pub struct EnterGuard<'a> {
     handle: &'a Handle,
     guard: context::EnterGuard,