diff --git a/histogram.h b/histogram.h
new file mode 100644
index 0000000..a86c9a3
--- /dev/null
+++ b/histogram.h
@@ -0,0 +1,5 @@
+#pragma once
+#include <vector>
+
+std::vector<size_t>
+make_histogram(const std::vector<double>& numbers, size_t bin_count);