diff --git a/packages/docusaurus-types/src/index.d.ts b/packages/docusaurus-types/src/index.d.ts
index 5d5932fd12..c71f4b9934 100644
--- a/packages/docusaurus-types/src/index.d.ts
+++ b/packages/docusaurus-types/src/index.d.ts
@@ -247,6 +247,8 @@ export interface Plugin<Content = unknown> {
   getClientModules?(): string[];
   extendCli?(cli: Command): void;
   injectHtmlTags?({
+    content,
+  }: {
     content: Content,
   }): {
     headTags?: HtmlTags;