diff --git a/.gitmodules b/.gitmodules
index 1fbd98b..696dca2 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "gf180mcu-pdk"]
 	path = gf180mcu-pdk
 	url = https://github.com/google/gf180mcu-pdk.git
+[submodule "skywater-pdk"]
+	path = skywater-pdk
+	url = https://github.com/google/skywater-pdk
diff --git a/skywater-pdk b/skywater-pdk
new file mode 160000
index 0000000..49d3c73
--- /dev/null
+++ b/skywater-pdk
@@ -0,0 +1 @@
+Subproject commit 49d3c73c2cd8ea42cdae5056440baef0f72e7e42