diff --git a/public/toc.json b/public/toc.json
index 9e3a652d..5f71c479 100644
--- a/public/toc.json
+++ b/public/toc.json
@@ -10,6 +10,10 @@
     "activeIcon": "mdi-file",
     "label": "คู่มือการใช้งานระบบแอดมิน",
     "children": [
+      {
+        "label": "บทนำ",
+        "path": "/manual/chapter-0-superadmin-maintenance"
+      },
       {
         "label": "การใช้งานผู้ดูแลระบบ",
         "path": "/manual/chapter-1-superadmin-maintenance"
diff --git a/src/modules/01_manual/MainPage.vue b/src/modules/01_manual/MainPage.vue
index cb9b931b..da9fc32e 100644
--- a/src/modules/01_manual/MainPage.vue
+++ b/src/modules/01_manual/MainPage.vue
@@ -80,7 +80,7 @@ onMounted(async () => {
 
       text.value = await res.text();
       found.value = true;
-      chapter.value = +match[1] - 1;
+      chapter.value = +match[1];
       parsed.value = md.parse(text.value, {});
     }
   }
diff --git a/src/views/MainLayout.vue b/src/views/MainLayout.vue
index d158b084..a945202e 100644
--- a/src/views/MainLayout.vue
+++ b/src/views/MainLayout.vue
@@ -226,7 +226,7 @@ function defaultOpen(index: number) {
       style="background: #273238"
       v-model="drawerMain"
       show-if-above
-      :width="260"
+      :width="290"
       :breakpoint="1023"
       :mini="drawerMini"
     >