diff --git a/xml/System.Numerics/Vector.xml b/xml/System.Numerics/Vector.xml
index 1ccaf238e73..d008e23f3d9 100644
--- a/xml/System.Numerics/Vector.xml
+++ b/xml/System.Numerics/Vector.xml
@@ -1870,7 +1870,7 @@ Note that this method returns a <xref:System.Single> instead of an integral type
         <param name="right">The second source vector.</param>
         <summary>Creates a new single-precision vector with elements selected between two specified single-precision source vectors based on an integral mask vector.</summary>
         <returns>The new vector with elements selected based on the mask.</returns>
-        <remarks>To be added.</remarks>
+        <remarks>The returned vector is equivalent to <paramref name="condition" /> <c>?</c> <paramref name="left" /> <c>:</c> <paramref name="right" /> on a per-bit basis.</remarks>
       </Docs>
     </Member>
     <Member MemberName="ConditionalSelect">
@@ -1915,7 +1915,7 @@ Note that this method returns a <xref:System.Single> instead of an integral type
         <param name="right">The second source vector.</param>
         <summary>Creates a new double-precision vector with elements selected between two specified double-precision source vectors based on an integral mask vector.</summary>
         <returns>The new vector with elements selected based on the mask.</returns>
-        <remarks>To be added.</remarks>
+        <remarks>The returned vector is equivalent to <paramref name="condition" /> <c>?</c> <paramref name="left" /> <c>:</c> <paramref name="right" /> on a per-bit basis.</remarks>
       </Docs>
     </Member>
     <Member MemberName="ConditionalSelect&lt;T&gt;">
@@ -1996,7 +1996,7 @@ Note that this method returns a <xref:System.Single> instead of an integral type
         <param name="right">The second source vector.</param>
         <summary>Creates a new vector of a specified type with elements selected between two specified source vectors of the same type based on an integral mask vector.</summary>
         <returns>The new vector with elements selected based on the mask.</returns>
-        <remarks>To be added.</remarks>
+        <remarks>The returned vector is equivalent to <paramref name="condition" /> <c>?</c> <paramref name="left" /> <c>:</c> <paramref name="right" /> on a per-bit basis.</remarks>
       </Docs>
     </Member>
     <Member MemberName="ConvertToDouble">
diff --git a/xml/System.Runtime.Intrinsics/Vector128.xml b/xml/System.Runtime.Intrinsics/Vector128.xml
index bd2b50a319a..8591029cb4c 100644
--- a/xml/System.Runtime.Intrinsics/Vector128.xml
+++ b/xml/System.Runtime.Intrinsics/Vector128.xml
@@ -1728,7 +1728,7 @@
         <param name="right">The vector that is selected when the corresponding bit in <paramref name="condition" /> is zero.</param>
         <summary>Conditionally selects a value from two vectors on a bitwise basis.</summary>
         <returns>A vector whose bits come from <paramref name="left" /> or <paramref name="right" /> based on the value of <paramref name="condition" />.</returns>
-        <remarks>To be added.</remarks>
+        <remarks>The returned vector is equivalent to <paramref name="condition" /> <c>?</c> <paramref name="left" /> <c>:</c> <paramref name="right" /> on a per-bit basis.</remarks>
         <exception cref="T:System.NotSupportedException">The type of <paramref name="condition" />, <paramref name="left" />, and <paramref name="right" /> (<typeparamref name="T" />) is not supported.</exception>
       </Docs>
     </Member>
diff --git a/xml/System.Runtime.Intrinsics/Vector256.xml b/xml/System.Runtime.Intrinsics/Vector256.xml
index 83642be9ed6..d6d92737cde 100644
--- a/xml/System.Runtime.Intrinsics/Vector256.xml
+++ b/xml/System.Runtime.Intrinsics/Vector256.xml
@@ -1497,7 +1497,7 @@
         <param name="right">The vector that is selected when the corresponding bit in <paramref name="condition" /> is zero.</param>
         <summary>Conditionally selects a value from two vectors on a bitwise basis.</summary>
         <returns>A vector whose bits come from <paramref name="left" /> or <paramref name="right" /> based on the value of <paramref name="condition" />.</returns>
-        <remarks>To be added.</remarks>
+        <remarks>The returned vector is equivalent to <paramref name="condition" /> <c>?</c> <paramref name="left" /> <c>:</c> <paramref name="right" /> on a per-bit basis.</remarks>
         <exception cref="T:System.NotSupportedException">The type of <paramref name="condition" />, <paramref name="left" />, and <paramref name="right" /> (<typeparamref name="T" />) is not supported.</exception>
       </Docs>
     </Member>
diff --git a/xml/System.Runtime.Intrinsics/Vector512.xml b/xml/System.Runtime.Intrinsics/Vector512.xml
index 5b83ec2b5dd..6aea84f0184 100644
--- a/xml/System.Runtime.Intrinsics/Vector512.xml
+++ b/xml/System.Runtime.Intrinsics/Vector512.xml
@@ -1228,7 +1228,7 @@
         <param name="right">The vector that is selected when the corresponding bit in <paramref name="condition" /> is zero.</param>
         <summary>Conditionally selects a value from two vectors on a bitwise basis.</summary>
         <returns>A vector whose bits come from <paramref name="left" /> or <paramref name="right" /> based on the value of <paramref name="condition" />.</returns>
-        <remarks>To be added.</remarks>
+        <remarks>The returned vector is equivalent to <paramref name="condition" /> <c>?</c> <paramref name="left" /> <c>:</c> <paramref name="right" /> on a per-bit basis.</remarks>
         <exception cref="T:System.NotSupportedException">The type of <paramref name="condition" />, <paramref name="left" />, and <paramref name="right" /> (<typeparamref name="T" />) is not supported.</exception>
       </Docs>
     </Member>
diff --git a/xml/System.Runtime.Intrinsics/Vector64.xml b/xml/System.Runtime.Intrinsics/Vector64.xml
index a1f9f621f20..5907c2942a1 100644
--- a/xml/System.Runtime.Intrinsics/Vector64.xml
+++ b/xml/System.Runtime.Intrinsics/Vector64.xml
@@ -1391,7 +1391,7 @@
         <param name="right">The vector that is selected when the corresponding bit in <paramref name="condition" /> is zero.</param>
         <summary>Conditionally selects a value from two vectors on a bitwise basis.</summary>
         <returns>A vector whose bits come from <paramref name="left" /> or <paramref name="right" /> based on the value of <paramref name="condition" />.</returns>
-        <remarks>To be added.</remarks>
+        <remarks>The returned vector is equivalent to <paramref name="condition" /> <c>?</c> <paramref name="left" /> <c>:</c> <paramref name="right" /> on a per-bit basis.</remarks>
         <exception cref="T:System.NotSupportedException">The type of <paramref name="condition" />, <paramref name="left" />, and <paramref name="right" /> (<typeparamref name="T" />) is not supported.</exception>
       </Docs>
     </Member>