diff --git a/GerbilManagerWebAPI/Dtos/CreateGerbilDto.cs b/GerbilManagerWebAPI/Dtos/CreateGerbilDto.cs
index 1e0077c..c2e6af5 100644
--- a/GerbilManagerWebAPI/Dtos/CreateGerbilDto.cs
+++ b/GerbilManagerWebAPI/Dtos/CreateGerbilDto.cs
@@ -4,8 +4,8 @@ namespace GerbilManagerWebAPI.Dtos
     {
         public required string Name { get; init; }
         public required GenderDto Gender { get; init; }
-        public Guid? Litter { get; init; }
-        public Guid? Breeder { get; init; }
+        public Guid Litter { get; init; }
+        public Guid Breeder { get; init; }
     }
     
 }
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diff --git a/GerbilManagerWebAPI/Dtos/CreateLitterDto.cs b/GerbilManagerWebAPI/Dtos/CreateLitterDto.cs
index 08440f3..89daad9 100644
--- a/GerbilManagerWebAPI/Dtos/CreateLitterDto.cs
+++ b/GerbilManagerWebAPI/Dtos/CreateLitterDto.cs
@@ -5,7 +5,7 @@ namespace GerbilManagerWebAPI.Dtos
         public required string Name { get; init; }
         public required DateTime Date { get; init; }
         public int? Strength { get; init; }
-        public Guid? Father { get; init; }
-        public Guid? Mother { get; init; }
+        public Guid Father { get; init; }
+        public Guid Mother { get; init; }
     }
 }
\ No newline at end of file
diff --git a/README.md b/README.md
index 50392ad..f041d92 100644
--- a/README.md
+++ b/README.md
@@ -9,4 +9,8 @@ docker compose up
 ## Create the initial database
 dotnet ef database update
 ## Create an migration script
-dotnet ef migrations add <name>
\ No newline at end of file
+dotnet ef migrations add <name>
+
+
+TODO:
+Backup docker volume database 
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