diff --git a/diagram.puml b/diagram.puml
new file mode 100644
index 0000000..c2cac69
--- /dev/null
+++ b/diagram.puml
@@ -0,0 +1,77 @@
+@startuml
+'https://plantuml.com/class-diagram
+
+skinparam linetype ortho
+
+entity "Movie" as movie {
+    * int : id <<generated>>
+    * createdAt : Date
+    * updatedAt : Date
+    * title : String
+      genre : String
+      year : int
+      runtime : int
+}
+
+entity "Screen room" as screen {
+    * int : id <<generated>>
+    * createdAt : Date
+    * updatedAt : Date
+    * name : String
+      capacity : int
+}
+
+entity "Screening" as screening {
+    * int : id <<generated>>
+    * createdAt : Date
+    * updatedAt : Date
+    * movie : Movie
+    * screen : Screen
+    * startTime : Date
+    price : decimal
+}
+
+entity "Customer" as customer {
+    * int : id <<generated>>
+    * createdAt : Date
+    * updatedAt : Date
+    * name : String
+}
+
+entity "Contact" as contact {
+    * int : id <<generated>>
+    * createdAt : Date
+    * updatedAt : Date
+    * customer : Customer
+      email : String
+      phone : String
+}
+
+entity "Ticket" as ticket {
+    * int : id <<generated>>
+    * createdAt : Date
+    * updatedAt : Date
+    * screening : Screening
+    * customer : Customer
+      seat : String
+}
+
+entity "Admin" as admin {
+    * int : id <<generated>>
+    * createdAt : Date
+    * updatedAt : Date
+    * name : String
+    * email : String
+    * password : String <<hashed>>
+    --
+    manages the movies and screenings,\nis not a customer
+}
+
+
+movie ||--o{ screening
+screen ||--o{ screening
+screening ||--o{ ticket
+customer ||--o{ ticket
+customer ||--|{ contact 
+
+@enduml
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diff --git a/er-diagram.png b/er-diagram.png
new file mode 100644
index 0000000..83e4a4a
Binary files /dev/null and b/er-diagram.png differ
diff --git a/user-stories.md b/user-stories.md
index b836475..d4e7f7e 100644
--- a/user-stories.md
+++ b/user-stories.md
@@ -1,3 +1,11 @@
 - As a customer, so I can receive my tickets, I want to provide my contact information.
 - As a customer, so I can decide which movie I want to watch, I want to see a list of movies.
-- As an admin, so I can manage the movies shown at the cinema, I want to update the list of movies.
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+- As a customer, so I can pick the best seat, I want to reserve a seat of my choice.
+- As a customer, so I can know the showtimes, I want to see the schedule of the movies.
+- As a customer, so I can know the price, I want to see the price of the tickets.
+- As an admin, so I can manage the movies shown at the cinema, I want to update the list of movies.
+- As an admin, so I can manage the schedule of the movies, I want to update the schedule of the movies.
+- As an admin, so I can manage the price of the tickets, I want to update the price of each screening.
+- As an admin, so that my account is secure, I would like to sign in using an email address and password.
+
+![er-diagram.png](er-diagram.png)
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