diff --git a/day3/src/input.cpp b/day3/src/input.cpp
index 8ae9c7c..6aff03f 100644
--- a/day3/src/input.cpp
+++ b/day3/src/input.cpp
@@ -91,3 +91,4 @@ int main()
 		fmt::print("\n");
 	}
 }
+TODO: this is literaly just popcnt. use simp popcnt over the packed integers i guess