diff --git a/dezero/core.py b/dezero/core.py
index 04985c9..dbd69f5 100644
--- a/dezero/core.py
+++ b/dezero/core.py
@@ -217,7 +217,7 @@ def forward(self, x0, x1):
 
     def backward(self, gy):
         gx0, gx1 = gy, gy
-        if self.x0_shape != self.x1_shape:  # for broadcaset
+        if self.x0_shape != self.x1_shape:  # for broadcast
             gx0 = dezero.functions.sum_to(gx0, self.x0_shape)
             gx1 = dezero.functions.sum_to(gx1, self.x1_shape)
         return gx0, gx1