diff --git a/internal/sql/ast/drop_behavior.go b/internal/sql/ast/drop_behavior.go
index 557073cd86..98ad07f235 100644
--- a/internal/sql/ast/drop_behavior.go
+++ b/internal/sql/ast/drop_behavior.go
@@ -1,7 +1,20 @@
 package ast
 
+// DropBehavior captures whether a Postgres DROP statement was qualified with
+// RESTRICT or CASCADE. The numeric values mirror pganalyze/pg_query_go's
+// DropBehavior enum:
+//
+//	DropBehavior_UNDEFINED = 0  (no behavior word supplied — same as RESTRICT in PG)
+//	DROP_RESTRICT          = 1
+//	DROP_CASCADE           = 2
 type DropBehavior uint
 
+const (
+	DropBehaviorUndefined DropBehavior = 0
+	DropBehaviorRestrict  DropBehavior = 1
+	DropBehaviorCascade   DropBehavior = 2
+)
+
 func (n *DropBehavior) Pos() int {
 	return 0
 }