diff --git a/parent.go b/parent.go
index 0bf2652..f85477f 100644
--- a/parent.go
+++ b/parent.go
@@ -14,5 +14,6 @@ type ParentType string
 const (
 	ParentTypeDatabase  ParentType = "database_id"
 	ParentTypePage      ParentType = "page_id"
+	ParentTypeBlock     ParentType = "block_id"
 	ParentTypeWorkspace ParentType = "workspace"
 )