Fix error message

diff --git a/linpy/domains.py b/linpy/domains.py
index 7f4fa65..a431a02 100644 (file)
--- a/linpy/domains.py
+++ b/linpy/domains.py
@@ -604,7 +604,7 @@ class Domain(GeometricObject):
         elif self.dimension == 3:
             return self._plot_3d(plot=plot, **kwargs)
         else:
-            raise ValueError('domain must be 2 or 3-dimensional')
+            raise ValueError('domain must be two or three-dimensional')
 
     def subs(self, symbol, expression=None):
         """