diff --git a/static/js/app/48-book-cache.js b/static/js/app/48-book-cache.js
index 84cf793..5b0781d 100644
--- a/static/js/app/48-book-cache.js
+++ b/static/js/app/48-book-cache.js
@@ -41,8 +41,10 @@ let _parseCodeSig = null;
 
 function _parsePreparationSig() {
   if (_parseCodeSig) return _parseCodeSig;
+  // window.__dioraPrepareSig: what an app layer adds to the preparation (the
+  // footnote detection in diora-android's native-ui.js) — a change there too.
   const src = [parseEpub, sanitizeEpubHtml, _injectImageBlobs, _resolveImageBlob, _parseEpubToc]
-    .map(f => String(f)).join('\n');
+    .map(f => String(f)).join('\n') + (window.__dioraPrepareSig || '');
   let h = 5381;
   for (let i = 0; i < src.length; i++) h = ((h << 5) + h + src.charCodeAt(i)) | 0;
   return (_parseCodeSig = (h >>> 0).toString(36) + '.' + src.length);
diff --git a/static/js/sw.js b/static/js/sw.js
index 24d713e..e4af648 100644
--- a/static/js/sw.js
+++ b/static/js/sw.js
@@ -2,7 +2,7 @@
  * diora service worker — caches the app shell for offline use.
  */
 
-const CACHE = 'diora-v107';
+const CACHE = 'diora-v108';
 const SHELL = [
   '/static/css/app.css',
   '/static/js/app/01-core.js',