diff --git a/bookshop/srv/cat-service.cds b/bookshop/srv/cat-service.cds
index 2441db25..db9724d1 100644
--- a/bookshop/srv/cat-service.cds
+++ b/bookshop/srv/cat-service.cds
@@ -1,16 +1,34 @@
-using { sap.capire.bookshop as my } from '../db/schema';
-service CatalogService @(path:'/browse') {
+using {sap.capire.bookshop as my} from '../db/schema';
 
-  /** For displaying lists of Books */
-  @readonly entity ListOfBooks as projection on Books
-  excluding { descr };
+service CatalogService @(path : '/browse') {
 
-  /** For display in details pages */
-  @readonly entity Books as projection on my.Books { *,
-    author.name as author
-  } excluding { createdBy, modifiedBy };
+  /**
+   * For displaying lists of Books
+   */
+  @readonly
+  entity ListOfBooks as projection on Books excluding {
+    descr
+  };
 
-  @requires: 'authenticated-user'
-  action submitOrder ( book: Books:ID, quantity: Integer ) returns { stock: Integer };
-  event OrderedBook : { book: Books:ID; quantity: Integer; buyer: String };
+  /**
+   * For display in details pages
+   */
+  @readonly
+  entity Books       as projection on my.Books {
+    * , author.name as author
+  } excluding {
+    createdBy,
+    modifiedBy
+  };
+
+  @requires : 'authenticated-user'
+  action submitOrder(book : Books:ID, quantity : Integer) returns {
+    stock : Integer
+  };
+
+  event OrderedBook : {
+    book     : Books:ID;
+    quantity : Integer;
+    buyer    : String
+  };
 }