1 files changed, 1 insertions, 1 deletions

diff --git a/Observer.h b/Observer.h
index 580d539..0661bf0 100644
--- a/Observer.h
+++ b/Observer.h
@@ -5,7 +5,7 @@ class Observer {
 private:
 
 public:
-	virtual void update();
+	virtual void update() = 0;
 
 };