diff --git a/.gitmodules b/.gitmodules
index baf1291..a341767 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "lib/permit2"]
 	path = lib/permit2
 	url = https://github.com/Uniswap/permit2
+[submodule "lib/tstorish"]
+	path = lib/tstorish
+	url = https://github.com/ProjectOpenSea/tstorish
diff --git a/lib/tstorish b/lib/tstorish
new file mode 160000
index 0000000..e0dd75e
--- /dev/null
+++ b/lib/tstorish
@@ -0,0 +1 @@
+Subproject commit e0dd75ed9fedfbbd3a226fdb0a57d3e78e5a2374