diff --git a/src/science_signal/signal.py b/src/science_signal/signal.py
index 0d48932..4c15847 100644
--- a/src/science_signal/signal.py
+++ b/src/science_signal/signal.py
@@ -264,7 +264,7 @@ class Signal:
             return self.operator_signal(other, "+")
         return self.operator_arraylike(other, "+")
 
-    def __rad__(self, other: ArrayLike | "Signal") -> "Signal":
+    def __radd__(self, other: ArrayLike | "Signal") -> "Signal":
         return self + other  # symetric
 
     def __sub__(self, other: ArrayLike | "Signal") -> "Signal":