diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..41bc8cc
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "sbt-contract"]
+	path = sbt-contract
+	url = https://github.com/kongtaoxing/WTF-SBT-cairo.git
diff --git a/sbt-contract b/sbt-contract
new file mode 160000
index 0000000..e3ac5e4
--- /dev/null
+++ b/sbt-contract
@@ -0,0 +1 @@
+Subproject commit e3ac5e4e7f7db707dd4eca51680e0a899d3e7dd0