diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..bcaed2e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "themes/sam"]
+	path = themes/sam
+	url = https://github.com/vickylai/hugo-theme-sam.git
diff --git a/themes/sam b/themes/sam
new file mode 160000
index 0000000..9a2db4d
--- /dev/null
+++ b/themes/sam
@@ -0,0 +1 @@
+Subproject commit 9a2db4d3dfca3f30fad627f3c8d2477ac141fe64