diff --git a/keras/src/utils/image_utils.py b/keras/src/utils/image_utils.py
index ca8289c9f9b..ac5f60aedfa 100644
--- a/keras/src/utils/image_utils.py
+++ b/keras/src/utils/image_utils.py
@@ -355,7 +355,10 @@ def smart_resize(
             Defaults to `"bilinear"`.
         data_format: `"channels_last"` or `"channels_first"`.
         backend_module: Backend module to use (if different from the default
-            backend).
+            backend). This parameter is for internal use and should typically
+            be left as None. When None, defaults to `keras.src.backend`.
+            Note: This does NOT allow switching between TensorFlow/JAX/PyTorch
+            backends - use `keras.config.set_backend()` for that purpose.
 
     Returns:
         Array with shape `(size[0], size[1], channels)`.