diff --git a/xml/System.Text/Ascii.xml b/xml/System.Text/Ascii.xml
index a878643cffb..e4215063c4f 100644
--- a/xml/System.Text/Ascii.xml
+++ b/xml/System.Text/Ascii.xml
@@ -16,8 +16,8 @@
   </Base>
   <Interfaces />
   <Docs>
-    <summary>To be added.</summary>
-    <remarks>To be added.</remarks>
+    <summary>Provides helper methods for working with ASCII-encoded text as bytes or characters.</summary>
+    <remarks>For APIs that take both a source and a destination buffer, the behavior of the method is undefined if the source and destination buffers overlap, unless the description specifies otherwise. The behavior of all APIs is undefined if another thread mutates the buffers while these APIs are operating on them. All case-conversion APIs are culture-unaware.</remarks>
   </Docs>
   <Members>
     <Member MemberName="Equals">
diff --git a/xml/System/Double.xml b/xml/System/Double.xml
index c65f59d706e..49786fbe5be 100644
--- a/xml/System/Double.xml
+++ b/xml/System/Double.xml
@@ -872,8 +872,8 @@ This computes `arctan(x) / π` in the interval `[-0.5, +0.5]`.
       </Parameters>
       <Docs>
         <param name="x">The value to be bitwise decremented.</param>
-        <summary>Decrements a value to the smallest value that compares less than a given value.</summary>
-        <returns>The smallest value that compares less than <paramref name="x" />.</returns>
+        <summary>Returns the largest value that compares less than a specified value.</summary>
+        <returns>The largest value that compares less than <paramref name="x" />.</returns>
         <remarks>To be added.</remarks>
         <inheritdoc cref="M:System.Numerics.IFloatingPointIeee754`1.BitDecrement(`0)" />
       </Docs>
@@ -910,7 +910,7 @@ This computes `arctan(x) / π` in the interval `[-0.5, +0.5]`.
       </Parameters>
       <Docs>
         <param name="x">The value to be bitwise incremented.</param>
-        <summary>Increments a value to the smallest value that compares greater than a given value.</summary>
+        <summary>Returns the smallest value that compares greater than a specified value.</summary>
         <returns>The smallest value that compares greater than <paramref name="x" />.</returns>
         <remarks>To be added.</remarks>
         <inheritdoc cref="M:System.Numerics.IFloatingPointIeee754`1.BitIncrement(`0)" />
diff --git a/xml/System/Single.xml b/xml/System/Single.xml
index 0d0c8bc319e..c44df155936 100644
--- a/xml/System/Single.xml
+++ b/xml/System/Single.xml
@@ -870,8 +870,8 @@ This computes `arctan(x) / π` in the interval `[-0.5, +0.5]`.
       </Parameters>
       <Docs>
         <param name="x">The value to be bitwise decremented.</param>
-        <summary>Decrements a value to the smallest value that compares less than a given value.</summary>
-        <returns>The smallest value that compares less than <paramref name="x" />.</returns>
+        <summary>Returns the largest value that compares less than a specified value.</summary>
+        <returns>The largest value that compares less than <paramref name="x" />.</returns>
         <remarks>To be added.</remarks>
         <inheritdoc cref="M:System.Numerics.IFloatingPointIeee754`1.BitDecrement(`0)" />
       </Docs>
@@ -908,7 +908,7 @@ This computes `arctan(x) / π` in the interval `[-0.5, +0.5]`.
       </Parameters>
       <Docs>
         <param name="x">The value to be bitwise incremented.</param>
-        <summary>Increments a value to the smallest value that compares greater than a given value.</summary>
+        <summary>Returns the smallest value that compares greater than a specified value.</summary>
         <returns>The smallest value that compares greater than <paramref name="x" />.</returns>
         <remarks>To be added.</remarks>
         <inheritdoc cref="M:System.Numerics.IFloatingPointIeee754`1.BitIncrement(`0)" />