diff --git a/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Core/BindingContract.cs b/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Core/BindingContract.cs
index 28755792..c4defd8b 100644
--- a/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Core/BindingContract.cs
+++ b/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Core/BindingContract.cs
@@ -16,7 +16,7 @@ public sealed class BindingContract : Entity
     public DateTimeOffset TerminatedAt { get; set; }
     public DateTimeOffset BindingFrom { get; init; }
     public DateTimeOffset ExpiringAt { get; init; }
-    public ICollection<Annex> RegisteredAnnexes { get; }
+    public ICollection<Annex> AttachedAnnexes { get; }
 
     private BindingContract(
         ContractId contractId,
@@ -31,7 +31,7 @@ private BindingContract(
         Duration = duration;
         ExpiringAt = expiringAt;
         BindingFrom = bindingFrom;
-        RegisteredAnnexes = [];
+        AttachedAnnexes = [];
 
         var @event = BindingContractStartedEvent.Raise(BindingFrom, ExpiringAt);
         RecordEvent(@event);
@@ -49,7 +49,7 @@ public void AttachAnnex(DateTimeOffset validFrom, DateTimeOffset now)
         BusinessRuleValidator.Validate(
             new AnnexCanOnlyBeAddedOnlyBeAddedToActiveBindingContractRule(TerminatedAt, ExpiringAt, now));
 
-        RegisteredAnnexes.Add(Annex.Attach(Id, validFrom));
+        AttachedAnnexes.Add(Annex.Attach(Id, validFrom));
     }
 
     public void Terminate(DateTimeOffset terminatedAt)
diff --git a/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Configurations/BindingContractEntityConfiguration.cs b/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Configurations/BindingContractEntityConfiguration.cs
index 7c36ba3f..a849c704 100644
--- a/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Configurations/BindingContractEntityConfiguration.cs
+++ b/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Configurations/BindingContractEntityConfiguration.cs
@@ -28,7 +28,7 @@ public void Configure(EntityTypeBuilder<BindingContract> builder)
         builder.Property(contract => contract.BindingFrom).IsRequired();
         builder.Property(contract => contract.ExpiringAt).IsRequired();
 
-        builder.OwnsMany<Annex>(nameof(BindingContract.RegisteredAnnexes), annex =>
+        builder.OwnsMany<Annex>(nameof(BindingContract.AttachedAnnexes), annex =>
         {
             annex.WithOwner().HasForeignKey(a => a.BindingContractId);
             annex.ToTable("Annexes");
diff --git a/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Migrations/20240412114229_AddAnnexes.Designer.cs b/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Migrations/20240412114229_AddAnnexes.Designer.cs
index 1ed67071..973e36f9 100644
--- a/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Migrations/20240412114229_AddAnnexes.Designer.cs
+++ b/Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Migrations/20240412114229_AddAnnexes.Designer.cs
@@ -83,7 +83,7 @@ protected override void BuildTargetModel(ModelBuilder modelBuilder)
 
             modelBuilder.Entity("EvolutionaryArchitecture.Fitnet.Contracts.Core.BindingContract", b =>
                 {
-                    b.OwnsMany("EvolutionaryArchitecture.Fitnet.Contracts.Core.Annex", "RegisteredAnnexes", b1 =>
+                    b.OwnsMany("EvolutionaryArchitecture.Fitnet.Contracts.Core.Annex", "AttachedAnnexes", b1 =>
                         {
                             b1.Property<Guid>("BindingContractId")
                                 .HasColumnType("uuid");
@@ -102,7 +102,7 @@ protected override void BuildTargetModel(ModelBuilder modelBuilder)
                                 .HasForeignKey("BindingContractId");
                         });
 
-                    b.Navigation("RegisteredAnnexes");
+                    b.Navigation("AttachedAnnexes");
                 });
 #pragma warning restore 612, 618
         }