diff --git a/.gitmodules b/.gitmodules
index e991d6256d..cb6ac9a1b4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -54,3 +54,6 @@
 [submodule "Externals/corrosion"]
 	path = Externals/corrosion
 	url = https://github.com/corrosion-rs/corrosion.git
+[submodule "Externals/SlippiRustExtensions"]
+	path = Externals/SlippiRustExtensions
+	url = https://github.com/project-slippi/slippi-rust-extensions.git
diff --git a/Externals/SlippiRustExtensions b/Externals/SlippiRustExtensions
new file mode 160000
index 0000000000..0af50920a7
--- /dev/null
+++ b/Externals/SlippiRustExtensions
@@ -0,0 +1 @@
+Subproject commit 0af50920a7a6d84d65bb05202868e6a63ce172be