diff --git a/todo.md b/todo.md
index 1010262..c2626a1 100644
--- a/todo.md
+++ b/todo.md
@@ -1,3 +1,4 @@
 1) Reverse(str)
 2) RandomString(set, len)
-3) 
+3) PadLeft(str, len, filler)
+4) PadRight(str, len, filler)