diff --git a/doc/source/advanced.md b/doc/source/advanced.md
index 926aafba2d..a0ffa708b2 100644
--- a/doc/source/advanced.md
+++ b/doc/source/advanced.md
@@ -123,10 +123,10 @@ order of the key.
 ```yaml
 hub:
   extraConfig:
-   00-first-config: |
-     # some code
-   10-second-config: |
-     # some other code
+    00-first-config: |
+      # some code
+    10-second-config: |
+      # some other code
 ```
 
 ### `hub.extraConfigMap`