diff --git a/histogram.h b/histogram.h
new file mode 100644
index 0000000..499763d
--- /dev/null
+++ b/histogram.h
@@ -0,0 +1,6 @@
+#pragma once 
+
+#include <vector>
+
+std::vector<size_t>
+make_histogram(const std::vector<double>& numbers, size_t bin_count);