diff --git a/text.h b/text.h
new file mode 100644
index 0000000..da16325
--- /dev/null
+++ b/text.h
@@ -0,0 +1,7 @@
+#pragma once
+#include <vector>
+
+const size_t SCREEN_WIDTH = 80;
+const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+
+void show_histogram_text(const std::vector<size_t>& bins);