diff --git a/.gitmodules b/.gitmodules
index 3095e1d..c51c1f2 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "extern/argparse"]
 	path = extern/argparse
 	url = https://github.com/p-ranav/argparse.git
+[submodule "extern/sbdlog"]
+	path = extern/spdlog
+	url = https://github.com/gabime/spdlog.git
diff --git a/extern/spdlog b/extern/spdlog
new file mode 160000
index 0000000..2ee8bac
--- /dev/null
+++ b/extern/spdlog
@@ -0,0 +1 @@
+Subproject commit 2ee8bac78e6525a8ad9a9196e65d502ce390d83a