diff --git a/dcs/frames/__init__.py b/dcs/frames/__init__.py
index a1a8023..1fd412d 100644
--- a/dcs/frames/__init__.py
+++ b/dcs/frames/__init__.py
@@ -22,6 +22,7 @@
 from .ch06_mixer import Ch06MixerWindow
 from .ch06_down_sampling import Ch06DownSamplingWindow
 from .ch06_up_sampling import Ch06UpSamplingWindow
+from .ch07_spreading import Ch07SpreadingWindow
 
 
 def get_windows() -> List[Type[base.Window]]:
@@ -41,6 +42,7 @@
         Ch06MixerWindow,
         Ch06DownSamplingWindow,
         Ch06UpSamplingWindow,
+        Ch07SpreadingWindow,
     ]