diff --git a/todo.txt b/todo.txt
index e3e4fce..8cfbb78 100644
--- a/todo.txt
+++ b/todo.txt
@@ -3,3 +3,4 @@
 3. Fix adding concatenation operators in shunting-yard function (very janky, compares against operators individually)
 Ideas for flags:
     -m <num> : Print <num>th match (-m 1 = first match, -m 2 = second match)
+    -g <num> : Print the <num>th group