1 files changed, 4 insertions, 3 deletions
diff --git a/src/client/documents/Documents.ts b/src/client/documents/Documents.ts
index ea7a3a8b6..392dca373 100644
--- a/src/client/documents/Documents.ts
+++ b/src/client/documents/Documents.ts
@@ -95,12 +95,13 @@ export namespace Docs {
 
     export namespace Prototypes {
 
-        type LayoutSource = { LayoutString: () => string };
+        type LayoutSource = { LayoutString: (ext?: string) => string };
         type CollectionLayoutSource = { LayoutString: (fieldStr: string, fieldExt?: string) => string };
         type CollectionViewType = [CollectionLayoutSource, string, string?];
         type PrototypeTemplate = {
             layout: {
                 view: LayoutSource,
+                ext?: string, // optional extension field for layout source
                 collectionView?: CollectionViewType
             },
             options?: Partial<DocumentOptions>
@@ -144,7 +145,7 @@ export namespace Docs {
                 options: { height: 32 }
             }],
             [DocumentType.PDF, {
-                layout: { view: PDFBox },
+                layout: { view: PDFBox, ext: anno },
                 options: { nativeWidth: 1200, curPage: 1 }
             }],
             [DocumentType.ICON, {
@@ -254,7 +255,7 @@ export namespace Docs {
             // synthesize the default options, the type and title from computed values and
             // whatever options pertain to this specific prototype
             let options = { title: title, type: type, baseProto: true, ...defaultOptions, ...(template.options || {}) };
-            let primary = layout.view.LayoutString();
+            let primary = layout.view.LayoutString(layout.ext);
             let collectionView = layout.collectionView;
             if (collectionView) {
                 options.layout = collectionView[0].LayoutString(collectionView[1], collectionView[2]);