diff --git a/README.md b/README.md
index a0fde0c..34ef905 100644
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+++ b/README.md
@@ -1,6 +1,4 @@
-[![NuGet](https://img.shields.io/nuget/v/MiniExcel.svg)](https://www.nuget.org/packages/MiniExcel)  [![](https://img.shields.io/nuget/dt/MiniExcel.svg)](https://www.nuget.org/packages/MiniExcel)  [![](https://i.imgur.com/eBmmZpp.png)](https://hackmd.io/@shps951023/HJXE2qnXO)
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+[![NuGet](https://img.shields.io/nuget/v/MiniExcel.svg)](https://www.nuget.org/packages/MiniExcel)  [![](https://img.shields.io/nuget/dt/MiniExcel.svg)](https://www.nuget.org/packages/MiniExcel)  [![Build status](https://ci.appveyor.com/api/projects/status/b2vustrwsuqx45f4/branch/master?svg=true)](https://ci.appveyor.com/project/shps951023/miniexcel/branch/master)
 ### Features
 - `Avoid large file OOM(out of memoery)` by IEnumerable Lazy `Step By Step getting one row cells` not until all rows read in memory  
 e.g:  Comparison of MiniExcel Query and ExcelDataReader/EPPlus/ClosedXml of reading large Xlsx File
@@ -177,6 +175,7 @@ Please Check [Project · todo](https://github.com/shps951023/MiniExcel/projects/
 
 - Custom datetime/timespan format can't mapping to DateTime/TimeSpan type
 - Same column name use last right one 
+- Must be a non-abstract type with a public parameterless constructor 
 
 ### Reference