diff --git a/IsotopeDistributionCalculator.py b/IsotopeDistributionCalculator.py
index 49df15f..c3e9679 100644
--- a/IsotopeDistributionCalculator.py
+++ b/IsotopeDistributionCalculator.py
@@ -459,7 +459,7 @@ def on_draw(self):
                                             rotation='vertical', annotation_clip=False)
                     else:
                         self.axes.annotate('%.*f' % (digits, i), xy=(i,j),
-                                            xytext=(-4.0,20+digits*8.0),
+                                            xytext=(-4.0,-20.0+digits*8.0),
                                             textcoords='offset points',
                                             rotation='vertical', annotation_clip=False)