diff --git a/.gitmodules b/.gitmodules
index d434c3db..05f44fd8 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -23,3 +23,6 @@
 [submodule "addins/sky130_osu_sc_t18"]
 	path = addins/sky130_osu_sc_t18
 	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_osu_sc_t18
+[submodule "addins/soc_flow"]
+	path = addins/soc_flow
+	url = https://github.com/stineje/soc_flow
diff --git a/addins/soc_flow b/addins/soc_flow
new file mode 160000
index 00000000..60ca3dac
--- /dev/null
+++ b/addins/soc_flow
@@ -0,0 +1 @@
+Subproject commit 60ca3dac1ae096740d3a6d19a5885f5f056ddb04