diff --git a/service/src/storage/config.ts b/service/src/storage/config.ts
index cacf9ab2..86be9076 100644
--- a/service/src/storage/config.ts
+++ b/service/src/storage/config.ts
@@ -99,7 +99,7 @@ export async function getOriginConfig() {
 
   if (!config.advancedConfig) {
     config.advancedConfig = new AdvancedConfig(
-      'You are ChatGPT, a large language model trained by OpenAI. Follow the user\'s instructions carefully.Respond using markdown.',
+      'You are ChatGPT, a large language model trained by OpenAI. Follow the user\'s instructions carefully.Respond using markdown (latex start with $).',
       0.8,
       1,
       20,