diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..2c34b0d
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "csidh/faster-csidh"]
+	path = csidh/faster-csidh
+	url = https://gitlab.cs.hs-rm.de/pqcrypto/faster-csidh.git
+[submodule "csidh/ref/csidh"]
+	path = csidh/ref/csidh
+	url = https://git.amongbytes.com/kris/csidh.git
diff --git a/csidh/faster-csidh b/csidh/faster-csidh
new file mode 160000
index 0000000..08d5c77
--- /dev/null
+++ b/csidh/faster-csidh
@@ -0,0 +1 @@
+Subproject commit 08d5c77d3a92c6b1391be6ac71ab30f32ebcb632
diff --git a/csidh/ref/csidh b/csidh/ref/csidh
new file mode 160000
index 0000000..08d5c77
--- /dev/null
+++ b/csidh/ref/csidh
@@ -0,0 +1 @@
+Subproject commit 08d5c77d3a92c6b1391be6ac71ab30f32ebcb632