diff --git a/Algorithms.txt b/Algorithms.txt
index 8482e6a6..efa98e44 100644
--- a/Algorithms.txt
+++ b/Algorithms.txt
@@ -1,5 +1,6 @@
 {
     "x16r":  "X16r",
+    "x16s":  "X16s",
     "keccakc":  "Keccakc", 
     "hsr":  "Hsr",
     "phi":  "Phi",