diff --git a/README.md b/README.md
index a5e0b02..9f00875 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@
   - [ ] NaughtyList
 - Crypto
   - [X] CommonMistake
-  - [ ] XMASSpirit
+  - [X] XMASSpirit
   - [X] MissingRaindeer
 - Reversing
   - [X] Infiltration