diff --git a/xml/System.Diagnostics.Metrics/Meter.xml b/xml/System.Diagnostics.Metrics/Meter.xml
index a0317e6e579..4f069c6b9b3 100644
--- a/xml/System.Diagnostics.Metrics/Meter.xml
+++ b/xml/System.Diagnostics.Metrics/Meter.xml
@@ -465,13 +465,13 @@ Example uses for ObservableCounter: The number of page faults for each process.
         <Parameter Name="description" Type="System.String" Index="3" FrameworkAlternate="net-7.0" />
       </Parameters>
       <Docs>
-        <typeparam name="T">To be added.</typeparam>
+        <typeparam name="T">The numerical type of the measurement.</typeparam>
         <param name="name">The instrument name. Cannot be <see langword="null" />.</param>
         <param name="observeValues">The callback to call to get the measurements when the <see cref="M:System.Diagnostics.Metrics.ObservableInstrument`1.Observe" /> is called by <see cref="M:System.Diagnostics.Metrics.MeterListener.RecordObservableInstruments" />.</param>
         <param name="unit">Optional instrument unit of measurements.</param>
         <param name="description">Optional instrument description.</param>
         <summary>Creates an ObservableUpDownCounter object. ObservableUpDownCounter is an Instrument that reports increasing or decreasing values when the instrument is being observed.</summary>
-        <returns>To be added.</returns>
+        <returns>A new observable up down counter.</returns>
         <remarks>
           <format type="text/markdown"><![CDATA[
 
@@ -513,13 +513,13 @@ Example uses for ObservableUpDownCounter: the process heap size or the approxima
         <Parameter Name="description" Type="System.String" Index="3" FrameworkAlternate="net-7.0" />
       </Parameters>
       <Docs>
-        <typeparam name="T">To be added.</typeparam>
+        <typeparam name="T">The numerical type of the measurement.</typeparam>
         <param name="name">The instrument name. Cannot be <see langword="null" />.</param>
         <param name="observeValue">The callback to call to get the measurements when the <see cref="M:System.Diagnostics.Metrics.ObservableInstrument`1.Observe" /> is called by <see cref="M:System.Diagnostics.Metrics.MeterListener.RecordObservableInstruments" /></param>
         <param name="unit">Optional instrument unit of measurements.</param>
         <param name="description">Optional instrument description.</param>
         <summary>Creates an ObservableUpDownCounter object. ObservableUpDownCounter is an Instrument that reports increasing or decreasing values when the instrument is being observed.</summary>
-        <returns>To be added.</returns>
+        <returns>A new observable up down counter.</returns>
         <remarks>
           <format type="text/markdown"><![CDATA[
 
@@ -561,13 +561,13 @@ Example uses for ObservableUpDownCounter: the process heap size or the approxima
         <Parameter Name="description" Type="System.String" Index="3" FrameworkAlternate="net-7.0" />
       </Parameters>
       <Docs>
-        <typeparam name="T">To be added.</typeparam>
+        <typeparam name="T">The numerical type of the measurement.</typeparam>
         <param name="name">The instrument name. Cannot be <see langword="null" />.</param>
         <param name="observeValue">The callback to call to get the measurements when the <see cref="M:System.Diagnostics.Metrics.ObservableInstrument`1.Observe" /> is called by <see cref="M:System.Diagnostics.Metrics.MeterListener.RecordObservableInstruments" />.</param>
         <param name="unit">Optional instrument unit of measurements.</param>
         <param name="description">Optional instrument description.</param>
         <summary>Creates an ObservableUpDownCounter object. ObservableUpDownCounter is an Instrument that reports increasing or decreasing values when the instrument is being observed.</summary>
-        <returns>To be added.</returns>
+        <returns>A new observable up down counter.</returns>
         <remarks>
           <format type="text/markdown"><![CDATA[
 
@@ -608,12 +608,12 @@ Example uses for ObservableUpDownCounter: the process heap size or the approxima
         <Parameter Name="description" Type="System.String" Index="2" FrameworkAlternate="net-7.0" />
       </Parameters>
       <Docs>
-        <typeparam name="T">To be added.</typeparam>
+        <typeparam name="T">The numerical type of the measurement.</typeparam>
         <param name="name">The instrument name. Cannot be <see langword="null" />.</param>
         <param name="unit">Optional instrument unit of measurements.</param>
         <param name="description">Optional instrument description.</param>
         <summary>Create a metrics UpDownCounter object.</summary>
-        <returns>To be added.</returns>
+        <returns>A new up down counter.</returns>
         <remarks>
           <format type="text/markdown"><![CDATA[
 
diff --git a/xml/System.Diagnostics.Metrics/ObservableUpDownCounter`1.xml b/xml/System.Diagnostics.Metrics/ObservableUpDownCounter`1.xml
index 7f6a4862287..37631782f49 100644
--- a/xml/System.Diagnostics.Metrics/ObservableUpDownCounter`1.xml
+++ b/xml/System.Diagnostics.Metrics/ObservableUpDownCounter`1.xml
@@ -26,7 +26,7 @@
   </Base>
   <Interfaces />
   <Docs>
-    <typeparam name="T">To be added.</typeparam>
+    <typeparam name="T">The type that the counter represents.</typeparam>
     <summary>A metrics-observable instrument that reports increasing or decreasing values when the instrument is being observed.
 Use this instrument to monitor the process heap size or the approximate number of items in a lock-free circular buffer, for example.
 To create an ObservableUpDownCounter object, use the <see cref="Overload:System.Diagnostics.Metrics.Meter.CreateObservableUpDownCounter" /> methods.</summary>
diff --git a/xml/System/TimeOnly.xml b/xml/System/TimeOnly.xml
index a6f1acf6121..72693c6f5f2 100644
--- a/xml/System/TimeOnly.xml
+++ b/xml/System/TimeOnly.xml
@@ -1001,8 +1001,8 @@ If `start` and `end` are equal, this method returns `false`, meaning there is ze
         <Parameter Name="provider" Type="System.IFormatProvider" Index="1" FrameworkAlternate="net-7.0" />
       </Parameters>
       <Docs>
-        <param name="s">To be added.</param>
-        <param name="provider">To be added.</param>
+        <param name="s">A span of characters to parse.</param>
+        <param name="provider">An object that provides culture-specific formatting information about <paramref name="s" />.</param>
         <summary>Parses a span of characters into a value.</summary>
         <returns>The result of parsing <paramref name="s" />.</returns>
         <remarks>To be added.</remarks>
@@ -1773,9 +1773,9 @@ The accepted standard formats are 'r', 'R', 'o', 'O', 't', and 'T'.
         <Parameter Name="result" Type="System.TimeOnly" RefType="out" Index="2" FrameworkAlternate="net-7.0" />
       </Parameters>
       <Docs>
-        <param name="s">To be added.</param>
-        <param name="provider">To be added.</param>
-        <param name="result">To be added.</param>
+        <param name="s">A span of characters to parse.</param>
+        <param name="provider">An object that provides culture-specific formatting information about <paramref name="s" />.</param>
+        <param name="result">When this method returns, contains the <see cref="T:System.TimeOnly" /> value equivalent to the time contained in <paramref name="s" />, if the conversion succeeded, or <see cref="P:System.TimeOnly.MinValue" /> if the conversion failed. The conversion fails if <paramref name="s" /> is the empty string or does not contain a valid string representation of a time. This parameter is passed uninitialized.</param>
         <summary>Tries to parses a span of characters into a value.</summary>
         <returns>
           <see langword="true" /> if <paramref name="s" /> was successfully parsed; otherwise, <see langword="false" />.</returns>
@@ -1810,11 +1810,12 @@ The accepted standard formats are 'r', 'R', 'o', 'O', 't', and 'T'.
         <Parameter Name="result" Type="System.TimeOnly" RefType="out" Index="2" FrameworkAlternate="net-7.0" />
       </Parameters>
       <Docs>
-        <param name="s">To be added.</param>
-        <param name="provider">To be added.</param>
-        <param name="result">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="s">A string to parse.</param>
+        <param name="provider">An object that provides culture-specific formatting information about <paramref name="s" />.</param>
+        <param name="result">When this method returns, contains the <see cref="T:System.TimeOnly" /> value equivalent to the time contained in <paramref name="s" />, if the conversion succeeded, or <see cref="P:System.TimeOnly.MinValue" /> if the conversion failed. The conversion fails if <paramref name="s" /> is the empty string or does not contain a valid string representation of a time. This parameter is passed uninitialized.</param>
+        <summary>Tries to parses a string into a value.</summary>
+        <returns>
+          <see langword="true" /> if <paramref name="s" /> was parsed successfully; otherwise, <see langword="false" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>