diff --git a/client/components/Reader/share/bookManager.js b/client/components/Reader/share/bookManager.js
index bb976085..8568cd0e 100644
--- a/client/components/Reader/share/bookManager.js
+++ b/client/components/Reader/share/bookManager.js
@@ -3,7 +3,7 @@ import localForage from 'localforage';
 import * as utils from '../../../share/utils';
 import BookParser from './BookParser';
 
-const maxDataSize = 100*1024*1024;//chars, not bytes
+const maxDataSize = 500*1024*1024;//chars, not bytes
 
 const bmMetaStore = localForage.createInstance({
     name: 'bmMetaStore'