Add note about simplify's order sensitivity
@@ -1664,7 +1664,9 @@ Figure 14. Simplification of a nearly circular polygon using a tolerance of 0.2
.. note::
`Invalid` geometric objects may result from simplification that does not
- preserve topology.
+ preserve topology and simplification may be sensitive to the order of
+ coordinates: two geometries differing only in order of coordinates may be
+ simplified differently.
Affine Transformations
