diff --git a/code/chapter03_object_detection_introduction/tiny_detector_demo/utils.py b/code/chapter03_object_detection_introduction/tiny_detector_demo/utils.py
index c536244..9e3f22e 100644
--- a/code/chapter03_object_detection_introduction/tiny_detector_demo/utils.py
+++ b/code/chapter03_object_detection_introduction/tiny_detector_demo/utils.py
@@ -632,7 +632,7 @@ def adjust_learning_rate(optimizer, scale):
     """
     for param_group in optimizer.param_groups:
         param_group['lr'] = param_group['lr'] * scale
-    print("DECAYING learning rate.\n The new LR is %f\n" % (optimizer.param_groups[1]['lr'],))
+    print("DECAYING learning rate.\n The new LR is %f\n" % (optimizer.param_groups[0]['lr'],))
 
 
 def accuracy(scores, targets, k):