diff --git a/src/base/vscodeTypes.d.ts b/src/base/vscodeTypes.d.ts
index 71e9019..741f4e8 100644
--- a/src/base/vscodeTypes.d.ts
+++ b/src/base/vscodeTypes.d.ts
@@ -401,5 +401,5 @@ export class LanguageModelChatMessageFunctionResultPart {
 }
 
 export interface LanguageModelChatMessage {
-	content2: string | LanguageModelChatMessageFunctionResultPart;
+	content2?: string | LanguageModelChatMessageFunctionResultPart;
 }