diff --git a/atlas.json b/atlas.json
index eed613f1..d1dc194a 100644
--- a/atlas.json
+++ b/atlas.json
@@ -12,16 +12,22 @@
     "pdf": {
       "version": "web",
       "toc": true,
+      "index": true,
       "syntaxhighlighting": true
     },
     "epub": {
+      "toc": true,
+      "index": true,
       "syntaxhighlighting": true
     },
     "mobi": {
+      "toc": true,
+      "index": true,
       "syntaxhighlighting": true
     },
     "html": {
       "toc": true,
+      "index": true,
       "syntaxhighlighting": true
     }
   },