diff --git a/chapter-01/temperature-io/main.c b/chapter-01/temperature-io/main.c
index 799ea95..51625b6 100644
--- a/chapter-01/temperature-io/main.c
+++ b/chapter-01/temperature-io/main.c
@@ -12,7 +12,7 @@ int main()
     tModifier = (5.0/9.0);
     while (fahr <= UPPER) {
         celsius = tModifier * (fahr - 32.0);
-        printf("%3.0f\t%5.1f\n", fahr, celsius);
+        printf("%3.0f°F\t%5.1f°C\n", fahr, celsius);
         fahr = fahr + STEP;
     }
 }