diff --git a/text.h b/text.h
index da16325..bbf4108 100644
--- a/text.h
+++ b/text.h
@@ -1,7 +1,7 @@
-#pragma once
+#ifndef TEXT_H_INCLUDED
+#define TEXT_H_INCLUDED
 #include <vector>
 
-const size_t SCREEN_WIDTH = 80;
-const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+void show_histogram_text (const std::vector<double>& bins,size_t MAX_ASTERISK, size_t bin_count);
 
-void show_histogram_text(const std::vector<size_t>& bins);
+#endif