diff --git a/readme-cn.md b/readme-cn.md
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   每次从kafka获取数据块的区间大小，默认为1M~10M，网络和IO较好的情况下，可以适当调高
 
 #### Offset
-  可选last和false，默认为last，表示从头从kafka开始读取数据
+  可选last和first，默认为last，表示从头从kafka开始读取数据
 
 
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diff --git a/readme.md b/readme.md
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 * The default size of the data block from kafka is 1M~10M. If the network and IO are better, you can adjust it higher.
 
 #### Offset
-* Optional last and false, the default is last, which means read data from kafka from the beginning
+* Optional last and first, the default is last, which means read data from kafka from the beginning
 
 
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