diff --git a/doc/UserGuide.md b/doc/UserGuide.md
index fcd5a7121..c2d761e41 100644
--- a/doc/UserGuide.md
+++ b/doc/UserGuide.md
@@ -34,7 +34,7 @@ Format: `help`
 > Help is also shown if you enter an incorrect command e.g. `abcd`
  
 ### Adding a person: `add`
-Adds a person to the address book<br>
+Adds a person to the address book. Peter by default is already added.<br>
 Format: `add NAME [p]p/PHONE_NUMBER [p]e/EMAIL [p]a/ADDRESS [t/TAG]...` 
  
 > Words in `UPPER_CASE` are the parameters, items in `SQUARE_BRACKETS` are optional, 
diff --git a/src/seedu/addressbook/data/AddressBook.java b/src/seedu/addressbook/data/AddressBook.java
index a99a92f9f..b95389a84 100644
--- a/src/seedu/addressbook/data/AddressBook.java
+++ b/src/seedu/addressbook/data/AddressBook.java
@@ -5,9 +5,7 @@
 import java.util.Map;
 import java.util.Set;
 
-import seedu.addressbook.data.person.Person;
-import seedu.addressbook.data.person.ReadOnlyPerson;
-import seedu.addressbook.data.person.UniquePersonList;
+import seedu.addressbook.data.person.*;
 import seedu.addressbook.data.person.UniquePersonList.DuplicatePersonException;
 import seedu.addressbook.data.person.UniquePersonList.PersonNotFoundException;
 import seedu.addressbook.data.tag.Tag;
@@ -31,6 +29,17 @@ public class AddressBook {
     public AddressBook() {
         allPersons = new UniquePersonList();
         allTags = new UniqueTagList();
+        Tag tagScientist     = new Tag("scientist");
+        Person peter = new Person(new Name("Peter"),
+                new Phone("98121265", false),
+                new Email("peter@nusgdg.org", false),
+                new Address("15 Science Drive", false),
+                new UniqueTagList(tagScientist));
+        try {
+            addPerson(peter);
+        } catch (DuplicatePersonException e) {
+            e.printStackTrace();
+        }
     }
 
     /**
diff --git a/src/seedu/addressbook/storage/StorageFile.java b/src/seedu/addressbook/storage/StorageFile.java
index 459632e67..61fa17f95 100644
--- a/src/seedu/addressbook/storage/StorageFile.java
+++ b/src/seedu/addressbook/storage/StorageFile.java
@@ -34,7 +34,7 @@ public class StorageFile {
      */
 
     /**
-     * Signals that the given file path does not fulfill the storage filepath constraints.
+     * Signals that the given file path does not fulfill the storage filepath constraints..
      */
     public static class InvalidStorageFilePathException extends IllegalValueException {
         public InvalidStorageFilePathException(String message) {
diff --git a/test/java/seedu/addressbook/data/AddressBookTest.java b/test/java/seedu/addressbook/data/AddressBookTest.java
index 79808d80b..9a8fde47e 100644
--- a/test/java/seedu/addressbook/data/AddressBookTest.java
+++ b/test/java/seedu/addressbook/data/AddressBookTest.java
@@ -119,7 +119,12 @@ public void addPerson_personAlreadyInListButHasTagNotInList_tagNotAdded() throws
 
     @Test
     public void containsPerson() throws Exception {
-        UniquePersonList personsWhoShouldBeIn = new UniquePersonList(aliceBetsy, bobChaplin);
+        Person peter = new Person(new Name("Peter"),
+                new Phone("98121265", false),
+                new Email("peter@nusgdg.org", false),
+                new Address("15 Science Drive", false),
+                new UniqueTagList(tagScientist));
+        UniquePersonList personsWhoShouldBeIn = new UniquePersonList(aliceBetsy, bobChaplin, peter);
         UniquePersonList personsWhoShouldNotBeIn = new UniquePersonList(charlieDouglas, davidElliot);
 
         for (Person personWhoShouldBeIn : personsWhoShouldBeIn) {