diff --git a/SabreTools.Models/NewExecutable/Enums.cs b/SabreTools.Models/NewExecutable/Enums.cs
index fba30a9..f0c68c3 100644
--- a/SabreTools.Models/NewExecutable/Enums.cs
+++ b/SabreTools.Models/NewExecutable/Enums.cs
@@ -148,6 +148,7 @@ namespace SabreTools.Models.NewExecutable
 
     public enum OperatingSystem : byte
     {
+        Unknown = 0x00,
         OS2 = 0x01,
         WINDOWS = 0x02,
         EU_MSDOS4 = 0x03,
diff --git a/SabreTools.Models/NewExecutable/Executable.cs b/SabreTools.Models/NewExecutable/Executable.cs
index f30f126..83bfa84 100644
--- a/SabreTools.Models/NewExecutable/Executable.cs
+++ b/SabreTools.Models/NewExecutable/Executable.cs
@@ -11,6 +11,7 @@ namespace SabreTools.Models.NewExecutable
     /// modules in the system and to support dynamic linking.
     /// </summary>
     /// <see href="http://bytepointer.com/resources/win16_ne_exe_format_win3.0.htm"/>
+    /// <see href="https://wiki.osdev.org/NE"/>
     public sealed class Executable
     {
         /// <summary>
@@ -57,5 +58,10 @@ namespace SabreTools.Models.NewExecutable
         /// Nonresident-Name table
         /// </summary>
         public NonResidentNameTableEntry[]? NonResidentNameTable { get; set; }
+
+        /// <summary>
+        /// Segment relocation data
+        /// </summary>
+        public PerSegmentData[]? SegmentRelocationData { get; set; }
     }
 }
diff --git a/SabreTools.Models/NewExecutable/ExecutableHeader.cs b/SabreTools.Models/NewExecutable/ExecutableHeader.cs
index 2ce2202..9fcb6b3 100644
--- a/SabreTools.Models/NewExecutable/ExecutableHeader.cs
+++ b/SabreTools.Models/NewExecutable/ExecutableHeader.cs
@@ -8,13 +8,12 @@ namespace SabreTools.Models.NewExecutable
     /// </summary>
     /// <see href="http://bytepointer.com/resources/win16_ne_exe_format_win3.0.htm"/>
     /// <see href="https://github.com/libyal/libexe/blob/main/documentation/Executable%20(EXE)%20file%20format.asciidoc#24-ne-extended-header"/>
+    /// <see href="https://wiki.osdev.org/NE"/>
     [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
     public sealed class ExecutableHeader
     {
         /// <summary>
-        /// Signature word.
-        /// "N" is low-order byte.
-        /// "E" is high-order byte.
+        /// "NE"
         /// </summary>
         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 2)]
         public string? Magic;
@@ -22,20 +21,22 @@ namespace SabreTools.Models.NewExecutable
         /// <summary>
         /// Version number of the linker.
         /// </summary>
+        /// <remarks>Also known as the major linker version</remarks>
         public byte LinkerVersion;
-        
+
         /// <summary>
         /// Revision number of the linker.
         /// </summary>
+        /// <remarks>Also known as the minor linker version</remarks>
         public byte LinkerRevision;
-        
+
         /// <summary>
         /// Entry Table file offset, relative to the beginning of the segmented EXE header.
         /// </summary>
         public ushort EntryTableOffset;
-        
+
         /// <summary>
-        /// Number of bytes in the entry table.
+        /// Length of entry table in bytes
         /// </summary>
         public ushort EntryTableSize;
 
@@ -81,12 +82,15 @@ namespace SabreTools.Models.NewExecutable
         /// <summary>
         /// Segment number:offset of CS:IP.
         /// </summary>
+        /// <remarks>CS:IP entry point, CS is index into segment table</remarks>
         public uint InitialCSIPSetting;
 
         /// <summary>
         /// Segment number:offset of SS:SP.
         /// </summary>
         /// <remarks>
+        /// SS:SP initial stack pointer, SS is index into segment table
+        /// 
         /// If SS equals the automatic data segment and SP equals
         /// zero, the stack pointer is set to the top of the
         /// automatic data segment just below the additional heap
@@ -105,7 +109,7 @@ namespace SabreTools.Models.NewExecutable
         public ushort ModuleReferenceTableSize;
 
         /// <summary>
-        /// Number of bytes in the Non-Resident Name Table.
+        /// Size of non-resident names table in bytes
         /// </summary>
         public ushort NonResidentNameTableSize;
 
@@ -166,18 +170,20 @@ namespace SabreTools.Models.NewExecutable
         /// </summary>
         [MarshalAs(UnmanagedType.U1)]
         public OperatingSystem TargetOperatingSystem;
-        
+
+        #region OS/2 Specific
+
         /// <summary>
         /// Other OS/2 flags
         /// </summary>
         [MarshalAs(UnmanagedType.U1)]
         public OS2Flag AdditionalFlags;
-        
+
         /// <summary>
         /// Offset to return thunks or start of gangload area
         /// </summary>
         public ushort ReturnThunkOffset;
-        
+
         /// <summary>
         /// Offset to segment reference thunks or size of gangload area
         /// </summary>
@@ -187,15 +193,17 @@ namespace SabreTools.Models.NewExecutable
         /// Minimum code swap area size
         /// </summary>
         public ushort MinCodeSwapAreaSize;
-        
+
         /// <summary>
         /// Windows SDK revison number
         /// </summary>
         public byte WindowsSDKRevision;
-        
+
         /// <summary>
         /// Windows SDK version number
         /// </summary>
         public byte WindowsSDKVersion;
+
+        #endregion
     }
 }
diff --git a/SabreTools.Models/NewExecutable/PerSegmentData.cs b/SabreTools.Models/NewExecutable/PerSegmentData.cs
index 1075618..31cc18a 100644
--- a/SabreTools.Models/NewExecutable/PerSegmentData.cs
+++ b/SabreTools.Models/NewExecutable/PerSegmentData.cs
@@ -7,7 +7,14 @@
     /// follow the segment data in the file. The relocation fixup information
     /// is defined as follows:
     /// </summary>
+    /// <remarks>
+    /// To find the relocation data for a segment, seek to:
+    ///     <see cref="SegmentTableEntry.Offset"/>
+    ///     * (1 << <see cref="ExecutableHeader.SegmentAlignmentShiftCount"/>)
+    ///     + <see cref="SegmentTableEntry.Length"/> 
+    /// </remarks>
     /// <see href="http://bytepointer.com/resources/win16_ne_exe_format_win3.0.htm"/>
+    /// <see href="https://wiki.osdev.org/NE"/>
     public sealed class PerSegmentData
     {
         /// <summary>
diff --git a/SabreTools.Models/NewExecutable/ResourceTypeResourceEntry.cs b/SabreTools.Models/NewExecutable/ResourceTypeResourceEntry.cs
index dbc3db5..a5cc660 100644
--- a/SabreTools.Models/NewExecutable/ResourceTypeResourceEntry.cs
+++ b/SabreTools.Models/NewExecutable/ResourceTypeResourceEntry.cs
@@ -7,6 +7,7 @@ namespace SabreTools.Models.NewExecutable
     /// the format of each resource (8 bytes each):
     /// </summary>
     /// <see href="http://bytepointer.com/resources/win16_ne_exe_format_win3.0.htm"/>
+    /// <see href="https://wiki.osdev.org/NE"/>
     [StructLayout(LayoutKind.Sequential)]
     public sealed class ResourceTypeResourceEntry
     {
@@ -16,11 +17,13 @@ namespace SabreTools.Models.NewExecutable
         /// of the alignment shift count value specified at
         /// beginning of the resource table.
         /// </summary>
+        /// <remarks>Byte offset is: Offset * (1 << <see cref="ResourceTable.AlignmentShiftCount"/>)</remarks>
         public ushort Offset;
 
         /// <summary>
         /// Length of the resource in the file (in bytes).
         /// </summary>
+        /// <remarks>Byte length is: Length * (1 << <see cref="ResourceTable.AlignmentShiftCount"/>)</remarks>
         public ushort Length;
 
         /// <summary>
diff --git a/SabreTools.Models/NewExecutable/SegmentTableEntry.cs b/SabreTools.Models/NewExecutable/SegmentTableEntry.cs
index 4cf7b08..6ca7e64 100644
--- a/SabreTools.Models/NewExecutable/SegmentTableEntry.cs
+++ b/SabreTools.Models/NewExecutable/SegmentTableEntry.cs
@@ -9,6 +9,7 @@ namespace SabreTools.Models.NewExecutable
     /// The following is the structure of a segment table entry.
     /// </summary>
     /// <see href="http://bytepointer.com/resources/win16_ne_exe_format_win3.0.htm"/>
+    /// <see href="https://wiki.osdev.org/NE"/>
     [StructLayout(LayoutKind.Sequential)]
     public sealed class SegmentTableEntry
     {
@@ -17,6 +18,7 @@ namespace SabreTools.Models.NewExecutable
         /// data, relative to the beginning of the file. Zero means no
         /// file data.
         /// </summary>
+        /// <remarks>Byte offset is: Offset * (1 << <see cref="ExecutableHeader.SegmentAlignmentShiftCount"/>)</remarks>
         public ushort Offset;
 
         /// <summary>