diff --git a/README.md b/README.md
index 6e51366..aa63327 100644
--- a/README.md
+++ b/README.md
@@ -10,5 +10,7 @@ In a directory for a specific day,
 * To run (assuming NuShell): `open sample.in | zig build run`;
 * To run (assuming bash): `zig build run < sample.in`.
 
+Most of the solutions are allocation-free.
+
 There are also some solutions in Scheme:
 https://oomza.cutegay.software/inga-lovinde/AdventOfCode-2023-functional