diff --git a/masque/pattern.py b/masque/pattern.py
index 36c083b..26d7293 100644
--- a/masque/pattern.py
+++ b/masque/pattern.py
@@ -448,7 +448,7 @@ class Pattern:
         Return a copy of the Pattern, deep-copying shapes and copying subpattern entries, but not
          deep-copying any referenced patterns.
 
-	See also: Pattern.deepcopy()
+        See also: Pattern.deepcopy()
 
         :return: A copy of the current Pattern.
         """