diff --git a/docs/reference/default-theme-search.md b/docs/reference/default-theme-search.md
index a7bfe79b..891ab8e8 100644
--- a/docs/reference/default-theme-search.md
+++ b/docs/reference/default-theme-search.md
@@ -120,7 +120,7 @@ export default defineConfig({
 
 - Type: `(html: string, env: MarkdownEnv, render: (markdown: string) => string) => string`
 
-You can pass a `preIndexRender` function to `themeConfig.search.options` that can modify or return entirely different HTML content before it is indexed.
+While processing in Node (not available client-side) you can pass a `node_preIndexRender` function to `themeConfig.search.options` that can modify or return entirely different HTML content before it is indexed.
 
 The function receives the following parameters:
 
@@ -137,7 +137,7 @@ export default defineConfig({
   themeConfig: {
     search: {
       options: {
-        preIndexRender: (html, env, render) =>
+        node_preIndexRender: (html, env, render) =>
           env.frontmatter?.title
             ? render('# ' + env.frontmatter?.title) + html
             : html
diff --git a/src/node/plugins/localSearchPlugin.ts b/src/node/plugins/localSearchPlugin.ts
index b5936a70..a32fbd10 100644
--- a/src/node/plugins/localSearchPlugin.ts
+++ b/src/node/plugins/localSearchPlugin.ts
@@ -64,8 +64,8 @@ export async function localSearchPlugin(
       if (searchConfig.options?.exclude?.(relativePath)) {
         return ''
       }
-      if (searchConfig?.options?.preIndexRender) {
-        return searchConfig.options.preIndexRender(html, env, (markdown) =>
+      if (searchConfig?.options?.node_preIndexRender) {
+        return searchConfig.options.node_preIndexRender(html, env, (markdown) =>
           md.render(markdown, env)
         )
       }
diff --git a/types/default-theme.d.ts b/types/default-theme.d.ts
index c12ce0c5..3d19a021 100644
--- a/types/default-theme.d.ts
+++ b/types/default-theme.d.ts
@@ -388,9 +388,9 @@ export namespace DefaultTheme {
     exclude?: (relativePath: string) => boolean
 
     /**
-     * Allow transformation of content before indexing
+     * Allow transformation of content before indexing (from Node only)
      */
-    preIndexRender?: (
+    node_preIndexRender?: (
       html: string,
       env: MarkdownEnv,
       render: (string) => string