diff --git a/frontend/js/viewer.js b/frontend/js/viewer.js
index 2d36b65..6682eee 100644
--- a/frontend/js/viewer.js
+++ b/frontend/js/viewer.js
@@ -312,7 +312,7 @@ const ReadingProgressManager = {
 // ---------------------------------------------------------------------------
 // File viewer
 // ---------------------------------------------------------------------------
-async function openFile(vaultName, filePath) {
+export async function openFile(vaultName, filePath) {
   state.currentVault = vaultName;
   state.currentPath = filePath;
   state.showingSource = false;