diff --git a/xml/ns-System.Text.Json.Serialization.xml b/xml/ns-System.Text.Json.Serialization.xml
index 8f291f63d19..956dd95f399 100644
--- a/xml/ns-System.Text.Json.Serialization.xml
+++ b/xml/ns-System.Text.Json.Serialization.xml
@@ -1,6 +1,6 @@
 <Namespace Name="System.Text.Json.Serialization">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>The System.Text.Json.Serialization namespace contains classes that are used to customize and extend serialization and deserialization of objects into JSON formatted documents or streams, either via an attribute model or via type converters.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-System.Text.Json.xml b/xml/ns-System.Text.Json.xml
index 639297133dd..33120340f8b 100644
--- a/xml/ns-System.Text.Json.xml
+++ b/xml/ns-System.Text.Json.xml
@@ -1,6 +1,6 @@
 <Namespace Name="System.Text.Json">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>The System.Text.Json namespace provides high-performance, low-allocating, and standards-compliant capabilities to process JavaScript Object Notation (JSON), which includes serializing objects to JSON text and deserializing JSON text to objects, with UTF-8 support built-in. It also provides types to read and write JSON text encoded as UTF-8, and to create an in-memory document object model (DOM) for random access of the JSON elements within a structured view of the data.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>