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-rw-r--r--futures/src/command.rs1
-rw-r--r--futures/src/subscription.rs1
2 files changed, 2 insertions, 0 deletions
diff --git a/futures/src/command.rs b/futures/src/command.rs
index 05c3a1d0..3d1ec3f9 100644
--- a/futures/src/command.rs
+++ b/futures/src/command.rs
@@ -1,4 +1,5 @@
/// A set of asynchronous actions to be performed by some runtime.
+#[must_use = "`Command` must be returned to runtime to take effect"]
#[derive(Debug)]
pub struct Command<T>(Internal<T>);
diff --git a/futures/src/subscription.rs b/futures/src/subscription.rs
index e96fa704..d18ec4f7 100644
--- a/futures/src/subscription.rs
+++ b/futures/src/subscription.rs
@@ -20,6 +20,7 @@ use crate::BoxStream;
/// `Hasher`.
///
/// [`Command`]: crate::Command
+#[must_use = "`Subscription` must be returned to runtime to take effect"]
pub struct Subscription<Hasher, Event, Output> {
recipes: Vec<Box<dyn Recipe<Hasher, Event, Output = Output>>>,
}