diff --git a/.gitignore b/.gitignore
index a7258d0..cb92568 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,6 +36,7 @@ wsl_venv/
 *.egg-info/
 .installed.cfg
 *.egg
+wheelhouse/
 
 # Installer logs
 pip-log.txt
diff --git a/pillow_jxl/JpegXLImagePlugin.py b/pillow_jxl/JpegXLImagePlugin.py
index bd38f79..31e933b 100644
--- a/pillow_jxl/JpegXLImagePlugin.py
+++ b/pillow_jxl/JpegXLImagePlugin.py
@@ -66,6 +66,14 @@ def load(self):
 
         return super().load()
 
+    # may be defined for contained formats
+    def load_seek(self, pos):
+        pass
+
+    # may be defined for blocked formats (e.g. PNG)
+    # def load_read(self, bytes):
+    #     pass
+
     def tell(self):
         return self.__frame