diff --git a/BACKLOG b/BACKLOG
index c63caf8..343f270 100644
--- a/BACKLOG
+++ b/BACKLOG
@@ -2,5 +2,6 @@
 
 1. Return number of bytes written from Arc4Gen::Generate().
 2. Implement safe storage.
+3. Implement Arc4 cipher.
 
 ========== < TODO ==========