diff --git a/histogram.h b/histogram.h
index 1eab698..07979b8 100644
--- a/histogram.h
+++ b/histogram.h
@@ -2,5 +2,3 @@
 #include <vector>
 
 std::vector<size_t> make_histogram(const std::vector<double>& numbers, size_t bin_count);
-double compute_bin_size(const std::vector<double>& numbers, size_t bin_count);
-void show_histogram_svg(const std::vector<size_t>& bins, double bin_size, double min_val);