diff --git a/src/main/java/seedu/address/model/AddressBook.java b/src/main/java/seedu/address/model/AddressBook.java
index 716a741c597..00069d64f29 100644
--- a/src/main/java/seedu/address/model/AddressBook.java
+++ b/src/main/java/seedu/address/model/AddressBook.java
@@ -78,7 +78,7 @@ public void addPerson(Contact p) {
     /**
      * Replaces the given contact {@code target} in the list with {@code editedContact}.
      * {@code target} must exist in the address book.
-     * The contact identity of {@code editedContact} must not be the same as another existing contact in the address book.
+     * The contact identity of {@code editedContact} must not be the same as another existing one in the address book.
      */
     public void setPerson(Contact target, Contact editedContact) {
         requireNonNull(editedContact);
diff --git a/src/main/java/seedu/address/model/Model.java b/src/main/java/seedu/address/model/Model.java
index d813222e5bb..fac138657d8 100644
--- a/src/main/java/seedu/address/model/Model.java
+++ b/src/main/java/seedu/address/model/Model.java
@@ -72,7 +72,7 @@ public interface Model {
     /**
      * Replaces the given contact {@code target} with {@code editedContact}.
      * {@code target} must exist in the address book.
-     * The contact identity of {@code editedContact} must not be the same as another existing contact in the address book.
+     * The contact identity of {@code editedContact} must not be the same as another existing one in the address book.
      */
     void setPerson(Contact target, Contact editedContact);
 
diff --git a/src/main/java/seedu/address/model/ReadOnlyAddressBook.java b/src/main/java/seedu/address/model/ReadOnlyAddressBook.java
index 978b62d366e..0ce99c330f0 100644
--- a/src/main/java/seedu/address/model/ReadOnlyAddressBook.java
+++ b/src/main/java/seedu/address/model/ReadOnlyAddressBook.java
@@ -1,7 +1,6 @@
 package seedu.address.model;
 
 import javafx.collections.ObservableList;
-
 import seedu.address.model.person.Contact;
 
 /**
diff --git a/src/main/java/seedu/address/model/person/UniquePersonList.java b/src/main/java/seedu/address/model/person/UniquePersonList.java
index 4030ff194f3..715fe89fde2 100644
--- a/src/main/java/seedu/address/model/person/UniquePersonList.java
+++ b/src/main/java/seedu/address/model/person/UniquePersonList.java
@@ -13,8 +13,8 @@
 
 /**
  * A list of persons that enforces uniqueness between its elements and does not allow nulls.
- * A contact is considered unique by comparing using {@code Contact#isSamePerson(Contact)}. As such, adding and updating of
- * persons uses Contact#isSamePerson(Contact) for equality so as to ensure that the contact being added or updated is
+ * A contact is considered unique by comparing using {@code Contact#isSamePerson(Contact)}. As such, adding and updating
+ * of persons uses Contact#isSamePerson(Contact) for equality so as to ensure that the contact being added or updated is
  * unique in terms of identity in the UniquePersonList. However, the removal of a contact uses Contact#equals(Object) so
  * as to ensure that the contact with exactly the same fields will be removed.
  *
diff --git a/src/main/java/seedu/address/ui/PersonCard.java b/src/main/java/seedu/address/ui/PersonCard.java
index 790c62347c5..b5a14eb1c4c 100644
--- a/src/main/java/seedu/address/ui/PersonCard.java
+++ b/src/main/java/seedu/address/ui/PersonCard.java
@@ -7,7 +7,6 @@
 import javafx.scene.layout.FlowPane;
 import javafx.scene.layout.HBox;
 import javafx.scene.layout.Region;
-
 import seedu.address.model.person.Contact;
 
 /**