diff --git a/packages/core/src/types.ts b/packages/core/src/types.ts
index 16d77b4..3fc3e19 100644
--- a/packages/core/src/types.ts
+++ b/packages/core/src/types.ts
@@ -587,6 +587,13 @@ export interface Language<
 	 */
 	validateLanguageOptions(languageOptions: Options["LangOptions"]): void;
 
+	/**
+	 * Normalizes languageOptions for this language.
+	 */
+	normalizeLanguageOptions?(
+		languageOptions: Options["LangOptions"],
+	): Options["LangOptions"];
+
 	/**
 	 * Helper for esquery that allows languages to match nodes against
 	 * class. esquery currently has classes like `function` that will