diff --git a/README.md b/README.md
index 0a04b44..d23854f 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ from ..util import lazy
 
 __getattr__, __dir__, __all__ = lazy.attach(
     __name__,
-    submodules=['rank']
+    submodules=['rank'],
     submod_attrs={
         '_gaussian': ['gaussian', 'difference_of_gaussians'],
         'edges': ['sobel', 'scharr', 'prewitt', 'roberts',