diff --git a/README.md b/README.md
index 44311c9..9035614 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ The Big nerd Ranch Swift Programming 2ed.
 |Ch.16 Bronze Challenge |[link](https://haeseongpark.github.io/swift/BNRSwift-Ch.16-Bronze-Challenge/)   |   [link](https://github.com/HaeSeongPark/BNRSwift/blob/master/16MonsterTown/MonsterTown/Town.swift#L15)|
 |Ch.16 Silver Challenge |[link](https://haeseongpark.github.io/swift/BNRSwift-Ch.16-Silver-Challenge/#)   |    [code](https://github.com/HaeSeongPark/BNRSwift/blob/master/16MonsterTown/MonsterTown/Mayor.swift)   [code1](https://github.com/HaeSeongPark/BNRSwift/blob/master/16MonsterTown/MonsterTown/Town.swift#L21)|
 |Ch.16 Gold Challenge |[link](https://haeseongpark.github.io/swift/BNRSwift-Ch.16-Gold-Challenge/#)   |     [code1](https://github.com/HaeSeongPark/BNRSwift/blob/master/16MonsterTown/MonsterTown/Mayor.swift#L13)   [code2](https://github.com/HaeSeongPark/BNRSwift/blob/master/16MonsterTown/MonsterTown/Mayor.swift#L31)   [code3](https://github.com/HaeSeongPark/BNRSwift/blob/master/16MonsterTown/MonsterTown/Town.swift#L58)|
+|Ch.16 Error Handling |[link](https://haeseongpark.github.io/swift/BNRSwift-EndOfChapter20/)   |   [link](https://github.com/HaeSeongPark/BNRSwift/blob/master/20ErrorHandling.playground/Contents.swift)|
 |Ch.24 Memory Management And ARC |[link](https://haeseongpark.github.io/swift/BNRSwift-EndOfChapter24/)   |   [link](https://github.com/HaeSeongPark/BNRSwift/tree/master/24CyclicalAssets/CyclicalAssets)|
 |Ch.24 Bronze Challenge |[link](https://haeseongpark.github.io/swift/BNRSwift-Ch.24-Bronze-Challenge/)   |   [link1](https://github.com/HaeSeongPark/BNRSwift/blob/master/24CyclicalAssets/CyclicalAssets/Person.swift#L45)     [link2](https://github.com/HaeSeongPark/BNRSwift/blob/master/24CyclicalAssets/CyclicalAssets/Accountant.swift/#L26)   [link3](https://github.com/HaeSeongPark/BNRSwift/blob/master/24CyclicalAssets/CyclicalAssets/Asset.swift#L33)|
 |Ch.24 Silver Challenge |[link](https://haeseongpark.github.io/swift/BNRSwift-Ch.24-Silver-Challenge/)   |   [link](https://github.com/HaeSeongPark/BNRSwift/blob/master/24CyclicalAssets/CyclicalAssets/Person.swift#L33)|