diff --git a/volume-1.sb b/volume-1.sb
index 6729f2bc..a9cd743e 100644
--- a/volume-1.sb
+++ b/volume-1.sb
@@ -3,7 +3,7 @@
 "bookoptions" : [
     "diagram",
     "lilypond",
-    "pictures
+    "pictures"
   ],
 "booktype" : "chorded",
 "subtitle" : "Tome 1",