diff --git a/chart/charts.py b/chart/charts.py
index 7f0d0d2..331afae 100644
--- a/chart/charts.py
+++ b/chart/charts.py
@@ -58,7 +58,7 @@
 
     bar.dataset(values + deviations, series=len(values))
     bar.axes.type('xyy')
-    bar.axes.label(2, None, 'kbps')
+    bar.axes.label(2, None, 'Kbps')
     if scale_x:
         bar.axes.label(0, *scale_x)