diff --git a/include/behaviortree_cpp/utils/signal.h b/include/behaviortree_cpp/utils/signal.h
index a49d7e605..fc1a0c28d 100644
--- a/include/behaviortree_cpp/utils/signal.h
+++ b/include/behaviortree_cpp/utils/signal.h
@@ -8,7 +8,7 @@
 namespace BT
 {
 /**
- * Super simple Signal/Slop implementation, AKA "Observable pattern".
+ * Super simple Signal/Slot implementation, AKA "Observable pattern".
  * The subscriber is active until it goes out of scope or Subscriber::reset() is called.
  */
 template <typename... CallableArgs>
@@ -34,7 +34,7 @@ class Signal
     }
   }
 
-  Subscriber subscribe(CallableFunction func)
+  [[nodiscard]] Subscriber subscribe(CallableFunction func)
   {
     Subscriber sub = std::make_shared<CallableFunction>(std::move(func));
     subscribers_.emplace_back(sub);