diff --git a/.gitmodules b/.gitmodules
index c3d199c..358b1e4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "lib/mem"]
 	path = lib/mem
 	url = https://github.com/thunderbrewhq/mem.git
+[submodule "lib/bc"]
+	path = lib/bc
+	url = https://github.com/thunderbrewhq/bc.git
diff --git a/lib/bc b/lib/bc
new file mode 160000
index 0000000..4f8d6e2
--- /dev/null
+++ b/lib/bc
@@ -0,0 +1 @@
+Subproject commit 4f8d6e201616bc1b2f1540f5650e6b85bb441568