diff --git a/.gitmodules b/.gitmodules
index 95d1c10..e6b053a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "vergesort"]
 	path = vergesort
 	url = https://github.com/Morwenn/vergesort
+[submodule "FlameGraph"]
+	path = FlameGraph
+	url = https://github.com/brendangregg/FlameGraph
diff --git a/FlameGraph b/FlameGraph
new file mode 160000
index 0000000..41fee1f
--- /dev/null
+++ b/FlameGraph
@@ -0,0 +1 @@
+Subproject commit 41fee1f99f9276008b7cd112fca19dc3ea84ac32