diff --git a/implementing-interfaces/net/sortex/books/Book.java b/implementing-interfaces/net/sortex/books/Book.java
index 53f9de6..f83ec72 100644
--- a/implementing-interfaces/net/sortex/books/Book.java
+++ b/implementing-interfaces/net/sortex/books/Book.java
@@ -10,7 +10,7 @@ public class Book implements Comparable<Book>{
   private String name;
   private int    year;
 
-  private static final String SEPARATOR = ",";
+  private static final String SEPARATOR = ", ";
 
   /**
    * Constructs a new Book with the given name and year.
diff --git a/writing-your-own-interfaces/com/superpower/filebrowser/FBDir.java b/writing-your-own-interfaces/com/superpower/filebrowser/FBDir.java
index 735ae04..429c26a 100644
--- a/writing-your-own-interfaces/com/superpower/filebrowser/FBDir.java
+++ b/writing-your-own-interfaces/com/superpower/filebrowser/FBDir.java
@@ -8,7 +8,7 @@ public FBDir(String name) {
   
   
   public String thumbnail() {
-    return "[dir ]";
+    return "[dir]";
   }
   
 }