diff --git a/reference/mysqli/constants.xml b/reference/mysqli/constants.xml
index c09485e856..26633a6a0d 100644
--- a/reference/mysqli/constants.xml
+++ b/reference/mysqli/constants.xml
@@ -29,6 +29,14 @@
      </para>
     </listitem>
    </varlistentry>
+   <varlistentry xml:id="constantmysqli-opt-read-timeout">
+    <term><constant>MYSQLI_OPT_READ_TIMEOUT</constant></term>
+    <listitem>
+     <para>
+      Command execution result timeout in seconds
+     </para>
+    </listitem>
+   </varlistentry>
    <varlistentry xml:id="constantmysqli-opt-local-infile">
     <term><constant>MYSQLI_OPT_LOCAL_INFILE</constant></term>
     <listitem>