diff --git a/doc/DeveloperGuide.md b/doc/DeveloperGuide.md
index c82c3afb9..f1b7921ab 100644
--- a/doc/DeveloperGuide.md
+++ b/doc/DeveloperGuide.md
@@ -47,6 +47,8 @@ Priority | As a ... | I want to ... | So that I can...
 `* * *` | user | find a person by name | locate details of persons without having to go through the entire list
 `* *` | user | hide [private contact details](#private-contact-detail) by default | minimize chance of someone else seeing them by accident
 `*` | user with many persons in the address book | sort persons by name | locate a person easily
+`*` | user who likes to travel | be able to tell the relative distance of the contact to my position | locate contacts easily
+`*` | user with many records | categorise records by tags | find the person easily
 
 
 ## Appendix B : Use Cases
@@ -74,6 +76,30 @@ Use case ends.
 > 3a1. AddressBook shows an error message <br>
   Use case resumes at step 2
 
+#### Use case: Rename a tag
+
+**MSS**
+
+1. User requests to name a tag with another
+2. Addressbook searches for affected persons
+3. Addressbook returns the names of persons affected, asks user for confirmation
+4. User confirms the replacement
+5. Addressbook replaces the tag in the taglists with the new tag
+
+**Extensions**
+
+1a. The new tag is not a valid tag
+
+> AddressBook shows error and asks for a new tag, resumes at step 2
+
+2a. The tag does not exist
+
+> Use case ends
+
+4a. User does not confirm the replacement
+
+> Use case ends
+
 ## Appendix C : Non Functional Requirements
 
 1. Should work on any [mainstream OS](#mainstream-os) as long as it has Java 8 or higher installed.