diff --git a/sources/getting-started/functional-api-guide.md b/sources/getting-started/functional-api-guide.md
index d0746ce..6da3f9d 100644
--- a/sources/getting-started/functional-api-guide.md
+++ b/sources/getting-started/functional-api-guide.md
@@ -288,7 +288,7 @@ tower_2 = Conv2D(64, (5, 5), padding='same', activation='relu')(tower_2)
 tower_3 = MaxPooling2D((3, 3), strides=(1, 1), padding='same')(input_img)
 tower_3 = Conv2D(64, (1, 1), padding='same', activation='relu')(tower_3)
 
-output = keras.layers.concatenate([tower_1, tower_2, tower_3], axis=1)
+output = keras.layers.concatenate([tower_1, tower_2, tower_3], axis=-1)
 ```
 
 ### 卷积层上的残差连接