diff --git a/src/main/java/org/ntlab/citrusserver/entities/Book.java b/src/main/java/org/ntlab/citrusserver/entities/Book.java
index c182121..c68c40e 100644
--- a/src/main/java/org/ntlab/citrusserver/entities/Book.java
+++ b/src/main/java/org/ntlab/citrusserver/entities/Book.java
@@ -17,7 +17,7 @@
         this.title = title;
         this.publicity = publicity;
         this.color = color;
-        
+
         this.time = time;
     }