diff --git a/docs/guide/extending-default-theme.md b/docs/guide/extending-default-theme.md
index 143dfc3a..035bf6bd 100644
--- a/docs/guide/extending-default-theme.md
+++ b/docs/guide/extending-default-theme.md
@@ -1,6 +1,6 @@
 # Extending the Default Theme
 
-VitePress' default theme is optimized for documentation, and a number of elements can be customized via `.vitepress/config.ts`. Consult the [Default Theme Config Overview](../reference/default-theme-config) for a comprehensive list of options.
+VitePress' default theme is optimized for documentation, and a number of elements can be customized via `.vitepress/config.[extension]`. Consult the [Default Theme Config Overview](../reference/default-theme-config) for a comprehensive list of options.
 
 However, there are a number of cases where configuration alone won't be enough. For example: