diff --git a/.gitmodules b/.gitmodules
index 9c00a19..459393e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "www.submarinecablemap.com"]
 	path = www.submarinecablemap.com
 	url = https://github.com/telegeography/www.submarinecablemap.com.git
+	branch = master