diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..f437145
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "Physics_Informed_Neural_Networks/PINNs"]
+	path = Physics_Informed_Neural_Networks/PINNs
+	url = git@github.com:maziarraissi/PINNs.git
\ No newline at end of file