diff --git a/notes/设计模式 - 观察者.md b/notes/设计模式 - 观察者.md
index 1b505d74..1f581dcf 100644
--- a/notes/设计模式 - 观察者.md	
+++ b/notes/设计模式 - 观察者.md	
@@ -82,7 +82,7 @@ public interface Observer {
 public class StatisticsDisplay implements Observer {
 
     public StatisticsDisplay(Subject weatherData) {
-        weatherData.reisterObserver(this);
+        weatherData.registerObserver(this);
     }
 
     @Override