diff --git a/masque/shapes/polygon.py b/masque/shapes/polygon.py
index 1fd6350..dc5afa1 100644
--- a/masque/shapes/polygon.py
+++ b/masque/shapes/polygon.py
@@ -96,11 +96,11 @@ class Polygon(Shape):
     @offset.setter
     def offset(self, val: ArrayLike) -> None:
         if numpy.any(val):
-            raise PatternError('Path offset is forced to (0, 0)')
+            raise PatternError('Polygon offset is forced to (0, 0)')
 
     def set_offset(self, val: ArrayLike) -> Self:
         if numpy.any(val):
-            raise PatternError('Path offset is forced to (0, 0)')
+            raise PatternError('Polygon offset is forced to (0, 0)')
         return self
 
     def translate(self, offset: ArrayLike) -> Self: