diff --git a/.gitmodules b/.gitmodules
index 0be7324933..2c14ed6c4f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -362,6 +362,10 @@
 	path = libs/flyweight
 	url = ../flyweight.git
 	fetchRecurseSubmodules = on-demand
+[submodule "polygon"]
+	path = libs/polygon
+	url = ../polygon.git
+	fetchRecurseSubmodules = on-demand
 [submodule "msm"]
 	path = libs/msm
 	url = ../msm.git
diff --git a/libs/polygon b/libs/polygon
new file mode 160000
index 0000000000..fe99aee370
--- /dev/null
+++ b/libs/polygon
@@ -0,0 +1 @@
+Subproject commit fe99aee370d02c129e8b0c76a8e202d0b1dedc8d