diff --git a/packages/docusaurus-plugin-content-docs/src/sidebarItemsGenerator.ts b/packages/docusaurus-plugin-content-docs/src/sidebarItemsGenerator.ts
index 8c19109af15a..f35c52493b0b 100644
--- a/packages/docusaurus-plugin-content-docs/src/sidebarItemsGenerator.ts
+++ b/packages/docusaurus-plugin-content-docs/src/sidebarItemsGenerator.ts
@@ -186,7 +186,7 @@ export const DefaultSidebarItemsGenerator: SidebarItemsGenerator = async functio
   }): Promise<SidebarItemCategory & WithPosition> {
     const categoryDirPath = path.join(
       version.contentPath,
-      item.dirName,
+      item.dirName, // fix https://github.com/facebook/docusaurus/issues/4638
       breadcrumb.join(BreadcrumbSeparator),
     );