diff --git a/.gitmodules b/.gitmodules
index fb008bc..bb0e98b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "test/Catch"]
 	path = test/Catch
 	url = https://github.com/philsquared/Catch.git
+[submodule "performance/benchmark"]
+	path = performance/benchmark
+	url = https://github.com/google/benchmark.git
diff --git a/performance/benchmark b/performance/benchmark
new file mode 160000
index 0000000..5b7683f
--- /dev/null
+++ b/performance/benchmark
@@ -0,0 +1 @@
+Subproject commit 5b7683f49e1e9223cf9927b24f6fd3d6bd82e3f8