diff --git a/utils/Quality_Relabel.py b/utils/Quality_Relabel.py
index 564113e..4e2935a 100644
--- a/utils/Quality_Relabel.py
+++ b/utils/Quality_Relabel.py
@@ -410,11 +410,11 @@ class Quality_Relabel:
                   self.signal_select[channel][SP * self.frequency:EP * self.frequency], label=channel,
                   color=self.color_cycle[0])
 
-        # plt_.arrow((EP + SP) // 2 * self.frequency,
-        #            self.signal_select[channel][SP * self.frequency:EP * self.frequency].max(),
-        #            (EP + SP) // 2 * self.frequency,
-        #            self.signal_select[channel][SP * self.frequency:EP * self.frequency].mean(),
-        #            )
+        plt_.arrow((SP + (EP - SP) // 2) * self.frequency,
+                   self.signal_select[channel][SP * self.frequency:EP * self.frequency].max(),
+                   (SP + (EP - SP) // 2) * self.frequency,
+                   self.signal_select[channel][SP * self.frequency:EP * self.frequency].mean(),
+                   )
 
         for j in event_code:
             if channel == "SpO2":