diff --git a/docs/content/2.guide/2.features/10.app-config.md b/docs/content/2.guide/2.features/10.app-config.md
index 5dcd0472808..f81e9335800 100644
--- a/docs/content/2.guide/2.features/10.app-config.md
+++ b/docs/content/2.guide/2.features/10.app-config.md
@@ -38,11 +38,11 @@ It is also possible to type app config manually:
 
 ```ts [index.d.ts]
 declare module '@nuxt/schema' {
-  interface AppConfig {
+  interface AppConfigInput {
     /** Theme configuration */
-    theme: {
+    theme?: {
       /** Primary app color */
-      primaryColor: string
+      primaryColor?: string
     }
   }
 }