diff --git a/2020/src/lib.rs b/2020/src/lib.rs
index a33be49..4148128 100644
--- a/2020/src/lib.rs
+++ b/2020/src/lib.rs
@@ -11,6 +11,7 @@ pub mod day17;
 pub mod day19;
 pub mod day2;
 //pub mod day20;
+pub mod day21;
 pub mod day3;
 pub mod day4;
 pub mod day5;