diff --git a/histogram.h b/histogram.h
new file mode 100644
index 0000000..08d8e34
--- /dev/null
+++ b/histogram.h
@@ -0,0 +1,9 @@
+#ifndef HISTOGRAM_H_INCLUDED
+#define HISTOGRAM_H_INCLUDED
+
+#include <vector>
+
+#endif // HISTOGRAM_H_INCLUDED
+
+
+