diff --git a/lib/book.js b/lib/book.js
index a9bc40cca..bdd4dfccd 100644
--- a/lib/book.js
+++ b/lib/book.js
@@ -94,6 +94,11 @@ var Book = function(root, context, parent) {
     _.bindAll(this);
 };
 
+// Return string representation
+Book.prototype.toString = function() {
+    return "[Book "+this.root+"]";
+};
+
 // Initialize and parse the book: config, summary, glossary
 Book.prototype.parse = function() {
     var that = this;