diff --git a/docs/diagrams/AddSequenceDiagram.puml b/docs/diagrams/AddSequenceDiagram.puml
new file mode 100644
index 00000000000..80d83b28ade
--- /dev/null
+++ b/docs/diagrams/AddSequenceDiagram.puml
@@ -0,0 +1,70 @@
+@startuml
+!include style.puml
+skinparam ArrowFontStyle plain
+
+box Logic LOGIC_COLOR_T1
+participant ":LogicManager" as LogicManager LOGIC_COLOR
+participant ":AddressBookParser" as AddressBookParser LOGIC_COLOR
+participant ":AddCommandParser" as AddCommandParser LOGIC_COLOR
+participant "a:AddCommand" as AddCommand LOGIC_COLOR
+participant "r:CommandResult" as CommandResult LOGIC_COLOR
+end box
+
+box Model MODEL_COLOR_T1
+participant "m:Model" as Model MODEL_COLOR
+end box
+'add parameters of add command here'
+[-> LogicManager : execute("add")
+activate LogicManager
+'add parameters of add command here'
+LogicManager -> AddressBookParser : parseCommand("add ")
+activate AddressBookParser
+
+create AddCommandParser
+AddressBookParser -> AddCommandParser
+activate AddCommandParser
+
+AddCommandParser --> AddressBookParser
+deactivate AddCommandParser
+'add parameters of add command here; replace '1''
+AddressBookParser -> AddCommandParser : parse("1")
+activate AddCommandParser
+
+create AddCommand
+AddCommandParser -> AddCommand
+activate AddCommand
+
+AddCommand --> AddCommandParser :
+deactivate AddCommand
+
+AddCommandParser --> AddressBookParser : a
+deactivate AddCommandParser
+'Hidden arrow to position the destroy marker below the end of the activation bar.
+AddCommandParser -[hidden]-> AddressBookParser
+destroy AddCommandParser
+
+AddressBookParser --> LogicManager : a
+deactivate AddressBookParser
+
+LogicManager -> AddCommand : execute(m)
+activate AddCommand
+'add parameters of add command here; replace '1''
+AddCommand -> Model : AddPerson(1)
+activate Model
+
+Model --> AddCommand
+deactivate Model
+
+create CommandResult
+AddCommand -> CommandResult
+activate CommandResult
+
+CommandResult --> AddCommand
+deactivate CommandResult
+
+AddCommand --> LogicManager : r
+deactivate AddCommand
+
+[<--LogicManager
+deactivate LogicManager
+@enduml