diff --git a/reference/mongodb/mongodb/driver/manager/construct.xml b/reference/mongodb/mongodb/driver/manager/construct.xml
index 643b86ff9d..5d177f4051 100644
--- a/reference/mongodb/mongodb/driver/manager/construct.xml
+++ b/reference/mongodb/mongodb/driver/manager/construct.xml
@@ -172,6 +172,11 @@ mongodb://[username:password@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][
             until the beginning of the next one. Defaults to 60,000
             milliseconds.
            </para>
+           <para>
+            Per the
+            <link xlink:href="&url.mongodb.sdam;#heartbeatfrequencyms">Server Discovery and Monitoring Specification</link>,
+            this value cannot be less than 500 milliseconds.
+           </para>
           </entry>
          </row>
          <row>
@@ -201,13 +206,21 @@ mongodb://[username:password@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][
           <entry>maxStalenessSeconds</entry>
           <entry><type>integer</type></entry>
           <entry>
-           Corresponds to the read preference's
-           <literal>"maxStalenessSeconds"</literal>. Specifies, in seconds, how
-           stale a secondary can be before the client stops using it for read
-           operations. By default, there is no maximum staleness and clients
-           will not consider a secondary’s lag when choosing where to direct a
-           read operation. For details, see
-           <classname>MongoDB\Driver\ReadPreference</classname>.
+           <para>
+            Corresponds to the read preference's
+            <literal>"maxStalenessSeconds"</literal>. Specifies, in seconds, how
+            stale a secondary can be before the client stops using it for read
+            operations. By default, there is no maximum staleness and clients
+            will not consider a secondary’s lag when choosing where to direct a
+            read operation. For details, see
+            <classname>MongoDB\Driver\ReadPreference</classname>.
+           </para>
+           <para>
+            If specified, the max staleness must be a signed 32-bit integer
+            greater than or equal to
+            <constant>MongoDB\Driver\ReadPreference::SMALLEST_MAX_STALENESS_SECONDS</constant>
+            (i.e. 90 seconds).
+           </para>
           </entry>
          </row>
          <row>