diff --git a/.gitmodules b/.gitmodules
index ed44d8e5..7a100595 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -11,3 +11,6 @@
 	path = lmdb
 	url = https://github.com/LMDB/lmdb.git
 	branch = mdb.RE/0.9
+[submodule "phc-winner-argon2"]
+	path = phc-winner-argon2
+	url = https://github.com/P-H-C/phc-winner-argon2.git
diff --git a/phc-winner-argon2 b/phc-winner-argon2
new file mode 160000
index 00000000..68dd41f7
--- /dev/null
+++ b/phc-winner-argon2
@@ -0,0 +1 @@
+Subproject commit 68dd41f75c4c9df95f403154c0e19252fcf0f513