diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..dab01a9
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "rc3-tiles"]
+	path = rc3_tiles
+	url = https://github.com/cbluoss/rc3_tiles.git
+	branch = master
diff --git a/rc3_tiles b/rc3_tiles
new file mode 160000
index 0000000..ce2b26c
--- /dev/null
+++ b/rc3_tiles
@@ -0,0 +1 @@
+Subproject commit ce2b26c7328c6b9c06d83bf6afffd90e23fff27f