1 files changed, 1 insertions, 1 deletions
diff --git a/src/client/views/collections/CollectionView.tsx b/src/client/views/collections/CollectionView.tsx
index 508b9e5e7..ca8b0c14e 100644
--- a/src/client/views/collections/CollectionView.tsx
+++ b/src/client/views/collections/CollectionView.tsx
@@ -73,7 +73,7 @@ export enum CollectionViewType {
     Pile = "pileup"
 }
 export interface CollectionViewCustomProps {
-    filterAddDocument: (doc: Doc | Doc[]) => boolean;  // allows a document that renders a Collection view to filter or modify any documents added to the collection (see PresBox for an example)
+    filterAddDocument?: (doc: Doc | Doc[]) => boolean;  // allows a document that renders a Collection view to filter or modify any documents added to the collection (see PresBox for an example)
     childLayoutTemplate?: () => Opt<Doc>;  // specify a layout Doc template to use for children of the collection
     childLayoutString?: string;  // specify a layout string to use for children of the collection
     childOpacity?: () => number;