diff --git a/skimage/transform/radon_transform.py b/skimage/transform/radon_transform.py
index b69439a2..32572f68 100644
--- a/skimage/transform/radon_transform.py
+++ b/skimage/transform/radon_transform.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 """
 radon.py - Radon and inverse radon transforms