diff --git a/source/includes/fact-platform-s390x-enterprise.rst b/source/includes/fact-platform-s390x-enterprise.rst
index d798d1eefed..a0d3d09607f 100644
--- a/source/includes/fact-platform-s390x-enterprise.rst
+++ b/source/includes/fact-platform-s390x-enterprise.rst
@@ -4,8 +4,14 @@
       :widths: 20 80
       :class: border-table
 
+      * - RHEL 6 s390x
+        - Support removed in MongoDB Enterprise 4.2.15.
+
+      * - SLES 12 s390x
+        - Support removed in MongoDB Enterprise 4.2.15.
+
       * - Ubuntu 18.04 s390x
-        - Support removed in MongoDB 4.2.15 Enterprise.
+        - Support removed in MongoDB Enterprise 4.2.15.
 
    |
 
@@ -27,13 +33,13 @@
      - Removed starting in 3.4.15
 
    * - RHEL/CentOS 6
-     - 4.2.4+
+     - 4.2.4 - 4.2.14
      - |checkmark|
      - Removed starting in 3.6.14
      - Removed starting in 3.4.22
 
    * - SLES 12
-     - |checkmark|
+     - Removed starting in 4.2.15
      - 4.0.6+
      - Removed starting in 3.6.17
      - Removed starting in 3.4.14
diff --git a/source/includes/fact-platform-support-enterprise-suse.rst b/source/includes/fact-platform-support-enterprise-suse.rst
index 2c983f518b6..206093af6fc 100644
--- a/source/includes/fact-platform-support-enterprise-suse.rst
+++ b/source/includes/fact-platform-support-enterprise-suse.rst
@@ -9,11 +9,6 @@ MongoDB {+version+} Enterprise Edition supports the following
 
 MongoDB only supports the 64-bit versions of these platforms.
 
-MongoDB {+version+} Enterprise Edition on
-:abbr:`SLES (SUSE Linux Enterprise Server)` also supports the
-:ref:`s390x<prod-notes-supported-platforms-s390x>` architecture on
-select platforms.
-
 See :ref:`prod-notes-supported-platforms` for more information.
 
 .. include:: /includes/admonition-wsl.rst
diff --git a/source/reference/configuration-options.txt b/source/reference/configuration-options.txt
index 233a125f8d0..de4b4a49437 100644
--- a/source/reference/configuration-options.txt
+++ b/source/reference/configuration-options.txt
@@ -2699,7 +2699,7 @@ Key Management Configuration Options
    *Type*: string
 
    
-   .. versionadded:: 4.0
+   .. versionadded:: 4.0 (and 4.2.15)
    
       Available on Windows and macOS as an alternative to
       :setting:`security.kmip.clientCertificateFile`. 
@@ -2715,7 +2715,7 @@ Key Management Configuration Options
    where the property can be one of the following:
    
    .. include:: /includes/extracts/ssl-facts-certificate-selector-properties.rst
-   
+
    .. include:: /includes/fact-enterprise-only-admonition.rst
 
 
diff --git a/source/reference/parameters.txt b/source/reference/parameters.txt
index fb08008ad15..bc6571bcec8 100644
--- a/source/reference/parameters.txt
+++ b/source/reference/parameters.txt
@@ -1848,11 +1848,40 @@ Replication Parameters
 
    |mongod-only|
 
-   Number of threads to use to apply replicated operations in parallel.
-   Values can range from 1 to 256 inclusive. You can only set
+   Maximum number of threads to use to apply replicated operations in
+   parallel. Values can range from 1 to 256 inclusive. You can only set
    :parameter:`replWriterThreadCount` at startup and cannot change this
    setting with the :dbcommand:`setParameter` command.
 
+   .. seealso::
+
+      :parameter:`replWriterMinThreadCount`
+
+.. parameter:: replWriterMinThreadCount
+
+   .. versionadded:: 4.2.15
+
+   *Type*: integer
+
+   *Default*: 0
+
+   |mongod-only|
+
+   Minimum number of threads to use to apply replicated operations in
+   parallel. Values can range from 0 to 256 inclusive. You can only set
+   :parameter:`replWriterMinThreadCount` at startup and cannot change
+   this setting with the :dbcommand:`setParameter` command.
+
+   Parallel application of replication operations uses up to
+   :parameter:`replWriterThreadCount` threads. If
+   :parameter:`replWriterMinThreadCount` is configured with a value
+   less than :parameter:`replWriterThreadCount`, the thread pool will
+   timeout idle threads until the total count of threads in the thread
+   pool is equal to :parameter:`replWriterMinThreadCount`.
+
+   :parameter:`replWriterMinThreadCount` must be configured with a value
+   that is less than or equal to :parameter:`replWriterThreadCount`.
+
 .. parameter:: rollbackTimeLimitSecs
 
    *Type*: 64-bit integer
diff --git a/source/reference/program/mongod.txt b/source/reference/program/mongod.txt
index c3401f19a2c..fbb35413ca3 100644
--- a/source/reference/program/mongod.txt
+++ b/source/reference/program/mongod.txt
@@ -3223,7 +3223,7 @@ Encryption Key Management Options
 .. option:: --kmipClientCertificateSelector <string>
 
    
-   .. versionadded:: 4.0
+   .. versionadded:: 4.0 (and 4.2.15)
    
       Available on Windows and macOS as an alternative to
       :option:`--kmipClientCertificateFile`. 
diff --git a/source/release-notes/4.0.txt b/source/release-notes/4.0.txt
index 61bc3aa69c1..9bbc0da90d4 100644
--- a/source/release-notes/4.0.txt
+++ b/source/release-notes/4.0.txt
@@ -1046,9 +1046,8 @@ and macOS for internal TLS/SSL communication within a cluster.
 The option :option:`--kmipClientCertificateSelector <mongod
 --kmipClientCertificateSelector>`
 (:setting:`security.kmip.clientCertificateSelector`) allows
-:binary:`~bin.mongod` and :binary:`~bin.mongos` to use system TLS/SSL
-certificate stores for Windows and macOS when using TLS/SSL connection to the
-KMIP server.
+:binary:`~bin.mongod` to use system TLS/SSL certificate stores for
+Windows and macOS when using TLS/SSL connection to the KMIP server.
 
 .. _4.0-deprecate-mmapv1: