diff --git a/data/sponge256sum b/data/sponge256sum
new file mode 100644
index 0000000000..a4eb16b1e3
--- /dev/null
+++ b/data/sponge256sum
@@ -0,0 +1,2 @@
+https://github.com/lordmulder/sponge-hash-aes256/
+#