diff --git a/reference/mysqli/constants.xml b/reference/mysqli/constants.xml
index 26633a6a0d..320dc66eeb 100644
--- a/reference/mysqli/constants.xml
+++ b/reference/mysqli/constants.xml
@@ -33,7 +33,7 @@
     <term><constant>MYSQLI_OPT_READ_TIMEOUT</constant></term>
     <listitem>
      <para>
-      Command execution result timeout in seconds
+      Command execution result timeout in seconds. Available as of PHP 7.2.0.
      </para>
     </listitem>
    </varlistentry>
diff --git a/reference/mysqli/mysqli/options.xml b/reference/mysqli/mysqli/options.xml
index cbc6e96e35..dfd128b9f5 100644
--- a/reference/mysqli/mysqli/options.xml
+++ b/reference/mysqli/mysqli/options.xml
@@ -61,7 +61,7 @@
           </row>
           <row>
            <entry><constant>MYSQLI_OPT_READ_TIMEOUT</constant></entry>
-           <entry>command execution result timeout in seconds</entry>
+           <entry>command execution result timeout in seconds. Available as of PHP 7.2.0.</entry>
           </row>
           <row>
            <entry><constant>MYSQLI_OPT_LOCAL_INFILE</constant></entry>