diff --git a/xml/System.Reflection.PortableExecutable/CorHeader.xml b/xml/System.Reflection.PortableExecutable/CorHeader.xml
index 38ef6e2e62a..0a75e32a8e8 100644
--- a/xml/System.Reflection.PortableExecutable/CorHeader.xml
+++ b/xml/System.Reflection.PortableExecutable/CorHeader.xml
@@ -24,8 +24,15 @@
   </Base>
   <Interfaces />
   <Docs>
-    <summary>To be added.</summary>
-    <remarks>To be added.</remarks>
+    <summary>Represents the Common Language Infrastructure (CLI) header of the .NET executable image.</summary>
+    <remarks>
+      <format type="text/markdown"><![CDATA[  
+
+## Remarks
+The CLI header contains information about .NET metadata in the Portable Executable (PE) file. The CLI header format is defined by the [ECMA-335 specification](https://www.ecma-international.org/publications-and-standards/standards/ecma-335/), section II.25.3.3. You can use the <xref:System.Reflection.PortableExecutable.PEHeaders.CorHeader> property to get the CLI header.
+
+ ]]></format>
+    </remarks>
   </Docs>
   <Members>
     <Member MemberName="CodeManagerTableDirectory">
@@ -54,8 +61,8 @@
         <ReturnType>System.Reflection.PortableExecutable.DirectoryEntry</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the Code Manager Table entry.</summary>
+        <value>The Code Manager Table entry.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -85,8 +92,8 @@
         <ReturnType>System.Int32</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the metadata token of the entry point method of this image.</summary>
+        <value>The metadata token of the entry point method.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -116,8 +123,8 @@
         <ReturnType>System.Reflection.PortableExecutable.DirectoryEntry</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the Export Address Table Jumps entry.</summary>
+        <value>The Export Address Table Jumps entry.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -147,8 +154,8 @@
         <ReturnType>System.Reflection.PortableExecutable.CorFlags</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the runtime flags for this image.</summary>
+        <value>A bitwise combination of runtime flags.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -178,8 +185,8 @@
         <ReturnType>System.UInt16</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the major part of the runtime version required to load this image.</summary>
+        <value>The major part of the runtime version</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -209,8 +216,8 @@
         <ReturnType>System.Reflection.PortableExecutable.DirectoryEntry</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the Managed Native Header entry.</summary>
+        <value>The Managed Native Header entry.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -240,9 +247,17 @@
         <ReturnType>System.Reflection.PortableExecutable.DirectoryEntry</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
-        <remarks>To be added.</remarks>
+        <summary>Gets the Metadata entry.</summary>
+        <value>The Metadata entry.</value>
+        <remarks>
+          <format type="text/markdown"><![CDATA[
+
+## Remarks
+
+The Metadata directory entry contains CLI metadata of the .NET assembly. The metadata layout is defined by [ECMA-335 specification](https://www.ecma-international.org/publications-and-standards/standards/ecma-335/), section II.24.
+
+          ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="MinorRuntimeVersion">
@@ -271,8 +286,8 @@
         <ReturnType>System.UInt16</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the minor part of the runtime version required to load this image.</summary>
+        <value>The minor part of the runtime version.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -302,8 +317,8 @@
         <ReturnType>System.Reflection.PortableExecutable.DirectoryEntry</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the Resources entry.</summary>
+        <value>The Resources entry.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -333,9 +348,17 @@
         <ReturnType>System.Reflection.PortableExecutable.DirectoryEntry</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
-        <remarks>To be added.</remarks>
+        <summary>Gets the Strong Name Signature entry.</summary>
+        <value>The Strong Name Signature entry.</value>
+        <remarks>
+          <format type="text/markdown"><![CDATA[
+
+## Remarks
+
+For more information about the strong name signature, see [Strong-named assemblies](/dotnet/standard/assembly/strong-named).
+
+          ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="VtableFixupsDirectory">
@@ -364,8 +387,8 @@
         <ReturnType>System.Reflection.PortableExecutable.DirectoryEntry</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the VTable Fixups entry.</summary>
+        <value>The VTable Fixups entry.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
diff --git a/xml/System.Reflection.PortableExecutable/DirectoryEntry.xml b/xml/System.Reflection.PortableExecutable/DirectoryEntry.xml
index ea01b604c55..3ee2c150da5 100644
--- a/xml/System.Reflection.PortableExecutable/DirectoryEntry.xml
+++ b/xml/System.Reflection.PortableExecutable/DirectoryEntry.xml
@@ -31,7 +31,7 @@
     </Attribute>
   </Attributes>
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Represents a directory entry in the Portable Executable (PE) image.</summary>
     <remarks>To be added.</remarks>
   </Docs>
   <Members>
@@ -61,9 +61,9 @@
         <Parameter Name="size" Type="System.Int32" Index="1" FrameworkAlternate="netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;net-5.0;net-6.0;net-7.0;net-8.0" />
       </Parameters>
       <Docs>
-        <param name="relativeVirtualAddress">To be added.</param>
-        <param name="size">To be added.</param>
-        <summary>To be added.</summary>
+        <param name="relativeVirtualAddress">The Relative Virtual Address of the entry.</param>
+        <param name="size">The size of the entry, in bytes.</param>
+        <summary>Instantiates a new instance of the <see cref="T:System.Reflection.PortableExecutable.DirectoryEntry" /> structure.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -93,7 +93,7 @@
         <ReturnType>System.Int32</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>Specifies the address of the entry relative to the base address of the image.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -123,7 +123,7 @@
         <ReturnType>System.Int32</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>Specifies the size of the entry, in bytes.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
diff --git a/xml/System.Reflection.PortableExecutable/PEMemoryBlock.xml b/xml/System.Reflection.PortableExecutable/PEMemoryBlock.xml
index e18cbe5d354..f7579bc4e2e 100644
--- a/xml/System.Reflection.PortableExecutable/PEMemoryBlock.xml
+++ b/xml/System.Reflection.PortableExecutable/PEMemoryBlock.xml
@@ -31,7 +31,7 @@
     </Attribute>
   </Attributes>
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Represents a block of memory in the Portable Executable (PE) image.</summary>
     <remarks>To be added.</remarks>
   </Docs>
   <Members>