diff --git a/reference/constraints.rst b/reference/constraints.rst
index 34ed5d08dab..aa9829b535a 100644
--- a/reference/constraints.rst
+++ b/reference/constraints.rst
@@ -77,6 +77,7 @@ Validation Constraints Reference
    constraints/Valid
    constraints/Traverse
    constraints/CssColor
+   constraints/Cascade
 
 The Validator is designed to validate objects against *constraints*.
 In real life, a constraint could be: "The cake must not be burned". In