diff --git a/src/main/java/org/ntlab/citrusserver/repositories/IBookListener.java b/src/main/java/org/ntlab/citrusserver/repositories/IBookListener.java
index c2f3b94..51675da 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/IBookListener.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/IBookListener.java
@@ -7,4 +7,6 @@
 
     void bookChanged(Account account, Book book);
 
+    void bookDeleted(Account account, Book book);
+
 }