diff --git a/CdOffsetDto.cs b/CdOffsetDto.cs
index 5c6c082fa..af2b6d93e 100644
--- a/CdOffsetDto.cs
+++ b/CdOffsetDto.cs
@@ -34,10 +34,21 @@ using Aaru.CommonTypes.Metadata;
 
 namespace Aaru.Dto
 {
+    /// <summary>
+    /// DTO from a CD drive read offset
+    /// </summary>
     public class CdOffsetDto : CdOffset
     {
+        /// <summary>
+        /// Build an empty DTO
+        /// </summary>
         public CdOffsetDto() {}
 
+        /// <summary>
+        /// Build a DTO using the specified offset and database ID
+        /// </summary>
+        /// <param name="offset">CD reading offset</param>
+        /// <param name="id">Database ID</param>
         public CdOffsetDto(CdOffset offset, int id)
         {
             Manufacturer = offset.Manufacturer;
@@ -48,6 +59,9 @@ namespace Aaru.Dto
             Id           = id;
         }
 
+        /// <summary>
+        /// Database ID
+        /// </summary>
         public int Id { get; set; }
     }
 }
\ No newline at end of file
diff --git a/DeviceDto.cs b/DeviceDto.cs
index ba358620c..0b448d776 100644
--- a/DeviceDto.cs
+++ b/DeviceDto.cs
@@ -37,10 +37,20 @@ using Aaru.CommonTypes.Metadata;
 
 namespace Aaru.Dto
 {
+    /// <summary>
+    /// DTO for known device
+    /// </summary>
     public class DeviceDto : DeviceReportV2
     {
+        /// <summary>
+        /// Build an empty DTO
+        /// </summary>
         public DeviceDto() {}
 
+        /// <summary>
+        /// Build a DTO from a device report
+        /// </summary>
+        /// <param name="report">Device report</param>
         public DeviceDto(DeviceReportV2 report)
         {
             ATA                       = report.ATA;
@@ -59,6 +69,13 @@ namespace Aaru.Dto
             GdRomSwapDiscCapabilities = report.GdRomSwapDiscCapabilities;
         }
 
+        /// <summary>
+        /// Build a DTO from a device report with the specified parameters
+        /// </summary>
+        /// <param name="report">Device report</param>
+        /// <param name="id">Database ID</param>
+        /// <param name="optimalMultipleSectorsRead">Optimal number of blocks for read</param>
+        /// <param name="canReadGdRomUsingSwapDisc">Can read GD-ROM using swap trick?</param>
         public DeviceDto(DeviceReportV2 report, int id, int optimalMultipleSectorsRead, bool? canReadGdRomUsingSwapDisc)
         {
             ATA                       = report.ATA;
@@ -170,10 +187,19 @@ namespace Aaru.Dto
             CanReadGdRomUsingSwapDisc  = canReadGdRomUsingSwapDisc;
         }
 
+        /// <summary>
+        /// Optimal maximum number of transfer blocks to read
+        /// </summary>
         public int OptimalMultipleSectorsRead { get; set; }
 
+        /// <summary>
+        /// Can read GD-ROM using disc swap trick?
+        /// </summary>
         public bool? CanReadGdRomUsingSwapDisc { get; set; }
 
+        /// <summary>
+        /// Database ID
+        /// </summary>
         public new int Id { get; set; }
 
         static TestedMedia ClearBinaries(TestedMedia media)
diff --git a/SyncDto.cs b/SyncDto.cs
index 3c71fa888..5d1fdfc1d 100644
--- a/SyncDto.cs
+++ b/SyncDto.cs
@@ -34,11 +34,26 @@ using System.Collections.Generic;
 
 namespace Aaru.Dto
 {
+    /// <summary>
+    /// DTO for database synchronization.
+    /// </summary>
     public class SyncDto
     {
+        /// <summary>
+        /// List of USB vendors
+        /// </summary>
         public List<UsbVendorDto>  UsbVendors  { get; set; }
+        /// <summary>
+        /// List of USB products
+        /// </summary>
         public List<UsbProductDto> UsbProducts { get; set; }
+        /// <summary>
+        /// List of CD read offsets
+        /// </summary>
         public List<CdOffsetDto>   Offsets     { get; set; }
+        /// <summary>
+        /// List of known devices
+        /// </summary>
         public List<DeviceDto>     Devices     { get; set; }
     }
 }
\ No newline at end of file
diff --git a/UsbProductDto.cs b/UsbProductDto.cs
index 42fd7bff6..738eba672 100644
--- a/UsbProductDto.cs
+++ b/UsbProductDto.cs
@@ -32,11 +32,26 @@
 
 namespace Aaru.Dto
 {
+    /// <summary>
+    /// DTO for USB product field
+    /// </summary>
     public class UsbProductDto
     {
+        /// <summary>
+        /// Database ID
+        /// </summary>
         public int    Id        { get; set; }
+        /// <summary>
+        /// Product ID
+        /// </summary>
         public ushort ProductId { get; set; }
+        /// <summary>
+        /// Product name
+        /// </summary>
         public string Product   { get; set; }
+        /// <summary>
+        /// Vendor ID
+        /// </summary>
         public ushort VendorId  { get; set; }
     }
 }
\ No newline at end of file
diff --git a/UsbVendorDto.cs b/UsbVendorDto.cs
index 4bdf75094..a5ad08396 100644
--- a/UsbVendorDto.cs
+++ b/UsbVendorDto.cs
@@ -32,9 +32,18 @@
 
 namespace Aaru.Dto
 {
+    /// <summary>
+    /// DTO for USB vendor field
+    /// </summary>
     public class UsbVendorDto
     {
+        /// <summary>
+        /// Vendor ID
+        /// </summary>
         public ushort VendorId { get; set; }
+        /// <summary>
+        /// Vendor
+        /// </summary>
         public string Vendor   { get; set; }
     }
 }
\ No newline at end of file