diff --git a/pyop2/types/set.py b/pyop2/types/set.py
index f47235dc6..f10c93404 100644
--- a/pyop2/types/set.py
+++ b/pyop2/types/set.py
@@ -596,7 +596,7 @@ def core_size(self):
 
     @utils.cached_property
     def constrained_size(self):
-        """Set size, owned elements."""
+        """Set size, owned constrained elements."""
         return sum(s.constrained_size for s in self._sets)
 
     @utils.cached_property