diff --git a/text.cpp b/text.cpp
index ef0b904..0144cd7 100644
--- a/text.cpp
+++ b/text.cpp
@@ -13,9 +13,9 @@ void show_histogram_text(const vector<size_t>& bins) {
             max_count = count;
     }
     for (size_t j = 0; j < bins.size(); j++) {
-        if (bins[j] < 100) cout << " ";
-        if (bins[j] < 10) cout << " ";
-        cout << bins[j] << "|";
+        if (bins[j] < 100) cerr << " ";
+        if (bins[j] < 10)  cerr << " ";
+        cerr << bins[j] << "|";
 
         size_t height = 0;
         if (max_count > MAX_ASTERISK) {
@@ -27,7 +27,7 @@ void show_histogram_text(const vector<size_t>& bins) {
             height = bins[j];
         }
         for (size_t i = 0; i < height; i++)
-            cout << "*";
-        cout << endl;
+            cerr << "*";
+        cerr << endl;
     }
 }