Added model tier summary

1 files changed, 2 insertions, 0 deletions

diff --git a/docs/DesignDoc.md b/docs/DesignDoc.md
index 79f2864..5d673b2 100644
--- a/docs/DesignDoc.md
+++ b/docs/DesignDoc.md
@@ -151,6 +151,8 @@ The Model Tier contains the classes responsible for handling and serving Need da
 > section will follow the same instructions that are given for the View
 > Tier above._
 
+In our model tier we have a Need class, a User class, and a UserAuth class. The Need class represents needs and has fields for all of their values. Users have a passwordHash field, storing a hashed version of their password, an List of integers, representing the ID's of needs in the basket, and the userType which determines their privileges. The UserAuth class stores a key, a username, and expiration. A key is generated for a user and is used to authenticate the user. The username is the name associated with the key and the expiration is how long until the user must login again.
+
 > _At appropriate places as part of this narrative provide **one** or more updated and **properly labeled**
 > static models (UML class diagrams) with some details such as associations (connections) between classes, and critical attributes and methods. (**Be sure** to revisit the Static **UML Review Sheet** to ensure your class diagrams are using correct format and syntax.)_
 >