diff --git a/docs/diagrams/DeleteScheduleSequenceDiagram.puml b/docs/diagrams/DeleteScheduleSequenceDiagram.puml
index 4ef1cc53ba4..4879e34af42 100644
--- a/docs/diagrams/DeleteScheduleSequenceDiagram.puml
+++ b/docs/diagrams/DeleteScheduleSequenceDiagram.puml
@@ -7,7 +7,7 @@ participant ":LogicManager" as LogicManager LOGIC_COLOR
 participant ":AddressBookParser" as AddressBookParser LOGIC_COLOR
 participant ":DeleteScheduleCommandParser" as DeleteScheduleCommandParser LOGIC_COLOR
 participant "d:DeleteScheduleCommand" as DeleteScheduleCommand LOGIC_COLOR
-participant ":CommandResult" as CommandResult LOGIC_COLOR
+participant "r:CommandResult" as CommandResult LOGIC_COLOR
 end box
 
 box Model MODEL_COLOR_T1
@@ -65,12 +65,12 @@ create CommandResult
 DeleteScheduleCommand -> CommandResult
 activate CommandResult
 
-CommandResult --> DeleteScheduleCommand
+CommandResult --> DeleteScheduleCommand : r
 deactivate CommandResult
 
-DeleteScheduleCommand --> LogicManager : result
+DeleteScheduleCommand --> LogicManager : r
 deactivate DeleteScheduleCommand
 
-[<-- LogicManager
+[<-- LogicManager : r
 deactivate LogicManager
 @enduml
diff --git a/docs/diagrams/DeleteTutorSequenceDiagram.puml b/docs/diagrams/DeleteTutorSequenceDiagram.puml
index f652df0fcb9..764d96b5148 100644
--- a/docs/diagrams/DeleteTutorSequenceDiagram.puml
+++ b/docs/diagrams/DeleteTutorSequenceDiagram.puml
@@ -7,7 +7,7 @@ participant ":LogicManager" as LogicManager LOGIC_COLOR
 participant ":AddressBookParser" as AddressBookParser LOGIC_COLOR
 participant ":DeleteTutorCommandParser" as DeleteTutorCommandParser LOGIC_COLOR
 participant "d:DeleteTutorCommand" as DeleteTutorCommand LOGIC_COLOR
-participant ":CommandResult" as CommandResult LOGIC_COLOR
+participant "r:CommandResult" as CommandResult LOGIC_COLOR
 end box
 
 box Model MODEL_COLOR_T1
@@ -59,12 +59,12 @@ create CommandResult
 DeleteTutorCommand -> CommandResult
 activate CommandResult
 
-CommandResult --> DeleteTutorCommand
+CommandResult --> DeleteTutorCommand : r
 deactivate CommandResult
 
-DeleteTutorCommand --> LogicManager : result
+DeleteTutorCommand --> LogicManager : r
 deactivate DeleteTutorCommand
 
-[<-- LogicManager
+[<-- LogicManager : r
 deactivate LogicManager
 @enduml
diff --git a/docs/diagrams/FindScheduleSequenceDiagram.puml b/docs/diagrams/FindScheduleSequenceDiagram.puml
index 6cb269656d8..ac3de2a68be 100644
--- a/docs/diagrams/FindScheduleSequenceDiagram.puml
+++ b/docs/diagrams/FindScheduleSequenceDiagram.puml
@@ -8,7 +8,7 @@ participant ":AddressBookParser" as AddressBookParser LOGIC_COLOR
 participant ":FindSchedule\nCommandParser" as FindScheduleCommandParser LOGIC_COLOR
 participant "e:TutorNameContains\nKeywordsPredicate" as TutorNameContainsKeywordsPredicate LOGIC_COLOR
 participant "d:FindSchedule\nCommand" as FindScheduleCommand LOGIC_COLOR
-participant ":CommandResult" as CommandResult LOGIC_COLOR
+participant "r:CommandResult" as CommandResult LOGIC_COLOR
 end box
 
 box Model MODEL_COLOR_T1
@@ -66,12 +66,12 @@ create CommandResult
 FindScheduleCommand -> CommandResult
 activate CommandResult
 
-CommandResult --> FindScheduleCommand
+CommandResult --> FindScheduleCommand : r
 deactivate CommandResult
 
-FindScheduleCommand --> LogicManager : result
+FindScheduleCommand --> LogicManager : r
 deactivate FindScheduleCommand
 
-[<--LogicManager
+[<--LogicManager : r
 deactivate LogicManager
 @enduml
diff --git a/docs/diagrams/ListScheduleSequenceDiagram.puml b/docs/diagrams/ListScheduleSequenceDiagram.puml
index bbcc49cd3e8..d1164158287 100644
--- a/docs/diagrams/ListScheduleSequenceDiagram.puml
+++ b/docs/diagrams/ListScheduleSequenceDiagram.puml
@@ -7,7 +7,7 @@ participant ":LogicManager" as LogicManager LOGIC_COLOR
 participant ":AddressBookParser" as AddressBookParser LOGIC_COLOR
 participant ":ListSchedule\nCommandParser" as ListScheduleCommandParser LOGIC_COLOR
 participant "l:ListSchedule\nCommand" as ListScheduleCommand LOGIC_COLOR
-participant ":CommandResult" as CommandResult LOGIC_COLOR
+participant "r:CommandResult" as CommandResult LOGIC_COLOR
 participant ":Person" as Person LOGIC_COLOR
 participant ":Tutor\nPredicate" as TutorPredicate LOGIC_COLOR
 participant ":Status\nPredicate" as StatusPredicate LOGIC_COLOR
@@ -104,12 +104,12 @@ create CommandResult
 ListScheduleCommand -> CommandResult
 activate CommandResult
 
-CommandResult --> ListScheduleCommand
+CommandResult --> ListScheduleCommand : r
 deactivate CommandResult
 
-ListScheduleCommand --> LogicManager : result
+ListScheduleCommand --> LogicManager : r
 deactivate ListScheduleCommand
 
-[<-- LogicManager
+[<-- LogicManager : r
 deactivate LogicManager
 @enduml
diff --git a/docs/diagrams/ListTutorSequenceDiagram.puml b/docs/diagrams/ListTutorSequenceDiagram.puml
index 2ea6afbe5da..11224d8eee4 100644
--- a/docs/diagrams/ListTutorSequenceDiagram.puml
+++ b/docs/diagrams/ListTutorSequenceDiagram.puml
@@ -6,7 +6,7 @@ box Logic LOGIC_COLOR_T1
 participant ":LogicManager" as LogicManager LOGIC_COLOR
 participant ":AddressBookParser" as AddressBookParser LOGIC_COLOR
 participant "d:ListTutorCommand" as ListTutorCommand LOGIC_COLOR
-participant ":CommandResult" as CommandResult LOGIC_COLOR
+participant "r:CommandResult" as CommandResult LOGIC_COLOR
 end box
 
 box Model MODEL_COLOR_T1
@@ -41,12 +41,12 @@ create CommandResult
 ListTutorCommand -> CommandResult
 activate CommandResult
 
-CommandResult --> ListTutorCommand
+CommandResult --> ListTutorCommand : r
 deactivate CommandResult
 
-ListTutorCommand --> LogicManager : result
+ListTutorCommand --> LogicManager : r
 deactivate ListTutorCommand
 
-[<--LogicManager
+[<--LogicManager : r
 deactivate LogicManager
 @enduml
diff --git a/docs/images/DeleteScheduleSequenceDiagram.png b/docs/images/DeleteScheduleSequenceDiagram.png
index 5a06206d94c..8ebc482323d 100644
Binary files a/docs/images/DeleteScheduleSequenceDiagram.png and b/docs/images/DeleteScheduleSequenceDiagram.png differ
diff --git a/docs/images/DeleteTutorSequenceDiagram.png b/docs/images/DeleteTutorSequenceDiagram.png
index 3bf7004285c..dc27bd45f55 100644
Binary files a/docs/images/DeleteTutorSequenceDiagram.png and b/docs/images/DeleteTutorSequenceDiagram.png differ
diff --git a/docs/images/FindScheduleSequenceDiagram.png b/docs/images/FindScheduleSequenceDiagram.png
index 2bc3ce8c4c5..9d9e1162d8f 100644
Binary files a/docs/images/FindScheduleSequenceDiagram.png and b/docs/images/FindScheduleSequenceDiagram.png differ
diff --git a/docs/images/ListScheduleSequenceDiagram.png b/docs/images/ListScheduleSequenceDiagram.png
index 88b5ca764b3..72468a089c0 100644
Binary files a/docs/images/ListScheduleSequenceDiagram.png and b/docs/images/ListScheduleSequenceDiagram.png differ
diff --git a/docs/images/ListTutorSequenceDiagram.png b/docs/images/ListTutorSequenceDiagram.png
index 55ed6cc89ed..240da07bdd6 100644
Binary files a/docs/images/ListTutorSequenceDiagram.png and b/docs/images/ListTutorSequenceDiagram.png differ