diff --git a/model/Core/Properties/to.md b/model/Core/Properties/to.md
index 9983b49c8..35e106774 100644
--- a/model/Core/Properties/to.md
+++ b/model/Core/Properties/to.md
@@ -8,7 +8,7 @@ References an Element on the right-hand side of a relationship.
 
 ## Description
 
-This field references an Element on the right-hand side of a relationship.
+This field references an Element on the right-hand side of a relationship.   If it is not provided, it indicates that there are no known relationships of the given type.
 
 ## Metadata