add missing comma

diff --git a/book.json b/book.json
index a563184868acb4997cc9af07fd712f2dc818b534..2beadd31a8c38c7225143ea11985514af91757fe 100644 (file)
--- a/book.json
+++ b/book.json
@@ -25,7 +25,7 @@
       "etoc": {
         "maxdepth": 3,
         "notoc": true
-      }
+      },
       "toolbar": {
         "buttons": [
           {