diff --git a/conf.sample.yml b/conf.sample.yml
index 55d8e63..f79e598 100644
--- a/conf.sample.yml
+++ b/conf.sample.yml
@@ -9,4 +9,8 @@ DB:
   # user: 'postgres'
   # password: 'mysecretpassword'
   # port: '5432'
-TransCronInterval: 10 # 单位秒 当事务等待这个时间之后，还没有变化，则进行一轮重试处理，包括prepared中的任务和commited的任务
+# the unit of following configurations is second
+
+# TransCronInterval: 3 # the interval to poll unfinished global transaction for every dtm process
+# TimeoutToFail: 35 # timeout for XA, TCC to fail. saga's timeout default to infinite, which can be overwritten in saga options
+# RetryInterval: 10 # the subtrans branch will be retried after this interval