diff --git a/histogram.h b/histogram.h
index 11954ba..b23987c 100644
--- a/histogram.h
+++ b/histogram.h
@@ -5,4 +5,7 @@
 
 std::vector<size_t>
 make_histogram(const std::vector<double>& numbers, size_t bin_count);
+
+std::vector<double>
+make_borders(const std::vector<double>& numbers, size_t bin_count);
 #endif // HISTOGRAM_H_INCLUDED
diff --git a/svg.h b/svg.h
new file mode 100644
index 0000000..4e8e921
--- /dev/null
+++ b/svg.h
@@ -0,0 +1,10 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+#include <vector>
+#include <iostream>
+#include <algorithm>
+
+void
+show_histogram_svg(const std::vector<size_t>& bins, const std::vector<double>& borders, size_t bin_count);
+
+#endif // SVG_H_INCLUDED