diff --git a/docs/examples/c/tmq_demo.c b/docs/examples/c/tmq_demo.c
index b16245d484..18eef02098 100644
--- a/docs/examples/c/tmq_demo.c
+++ b/docs/examples/c/tmq_demo.c
@@ -92,7 +92,6 @@ void* prepare_data(void* arg) {
 
 // ANCHOR: msg_process
 int32_t msg_process(TAOS_RES* msg) {
-  char        buf[1024];  // buf to store the row content
   int32_t     rows = 0;
   const char* topicName = tmq_get_topic_name(msg);
   const char* dbName    = tmq_get_db_name(msg);
@@ -371,8 +370,8 @@ void consume_repeatly(tmq_t* tmq) {
 
     code = tmq_offset_seek(tmq, topic_name, p->vgId, p->begin);
     if (code != 0) {
-      fprintf(stderr, "Failed to seek offset, topic: %s, groupId: %s, clientId: %s, ErrCode: 0x%x, ErrMessage: %s.\n",
-              topic_name, config.group_id, config.client_id, code, tmq_err2str(code));
+      fprintf(stderr, "Failed to seek offset, topic: %s, groupId: %s, clientId: %s, vgId: %d, ErrCode: 0x%x, ErrMessage: %s.\n",
+              topic_name, config.group_id, config.client_id, p->vgId, code, tmq_err2str(code));
       break;
     }
   }
diff --git a/docs/examples/c/with_reqid_demo.c b/docs/examples/c/with_reqid_demo.c
index 8942077f67..1a1a53acc6 100644
--- a/docs/examples/c/with_reqid_demo.c
+++ b/docs/examples/c/with_reqid_demo.c
@@ -57,7 +57,6 @@ static int DemoWithReqId() {
 
   fprintf(stdout, "query successfully, got %d fields, the sql is: %s.\n", num_fields, sql);
 
-
   // fetch the records row by row
   while ((row = taos_fetch_row(result))) {
     // Add your data processing logic here