diff --git a/.gitmodules b/.gitmodules
index 7e7a6d578b1fc909fe1624614ea62fdf65fa24b4..56b5ee0a3c49d8987b3bcfd4ed5a4d989e38b079 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -5,6 +5,8 @@
 [submodule "showcase-definition"]
 	path = showcase-definition
 	url = ../definitions/showcase-definition
+	branch = main
 [submodule "introductory-definition"]
 	path = introductory-definition
-	url = ../definitions/introductory-definition
\ No newline at end of file
+	url = ../definitions/introductory-definition
+	branch = main