diff --git a/reference/uodbc/functions/odbc-fetch-array.xml b/reference/uodbc/functions/odbc-fetch-array.xml
index 400cc371b3a5..512e95b30280 100644
--- a/reference/uodbc/functions/odbc-fetch-array.xml
+++ b/reference/uodbc/functions/odbc-fetch-array.xml
@@ -33,9 +33,12 @@
     <varlistentry>
      <term><parameter>row</parameter></term>
      <listitem>
-      <para>
-       Optionally choose which row number to retrieve.
-      </para>
+      <simpara>
+       The 1-based number of the row to retrieve. If omitted or &null;, the
+       next row of the result set is fetched, as
+       <function>odbc_fetch_row</function> does. If the driver does not
+       support fetching rows by number, this parameter is ignored.
+      </simpara>
      </listitem>
     </varlistentry>
    </variablelist>
@@ -65,7 +68,9 @@
      <row>
       <entry>8.4.0</entry>
       <entry>
-       <parameter>row</parameter> is now nullable.
+       <parameter>row</parameter> is now nullable, and its default value
+       changed from <literal>-1</literal> to &null;, consistent with
+       <function>odbc_fetch_row</function>.
       </entry>
      </row>
     </tbody>
diff --git a/reference/uodbc/functions/odbc-fetch-into.xml b/reference/uodbc/functions/odbc-fetch-into.xml
index 3642c9c89335..fb62debace8e 100644
--- a/reference/uodbc/functions/odbc-fetch-into.xml
+++ b/reference/uodbc/functions/odbc-fetch-into.xml
@@ -45,9 +45,12 @@
     <varlistentry>
      <term><parameter>row</parameter></term>
      <listitem>
-      <para>
-       The row number.
-      </para>
+      <simpara>
+       The 1-based number of the row to fetch. If omitted or &null;, the
+       next row of the result set is fetched, as
+       <function>odbc_fetch_row</function> does. If the driver does not
+       support fetching rows by number, this parameter is ignored.
+      </simpara>
      </listitem>
     </varlistentry>
    </variablelist>
@@ -77,7 +80,9 @@
      <row>
       <entry>8.4.0</entry>
       <entry>
-       <parameter>row</parameter> is now nullable.
+       <parameter>row</parameter> is now nullable, and its default value
+       changed from <literal>0</literal> to &null;, consistent with
+       <function>odbc_fetch_row</function>.
       </entry>
      </row>
     </tbody>
diff --git a/reference/uodbc/functions/odbc-fetch-object.xml b/reference/uodbc/functions/odbc-fetch-object.xml
index 318446855c96..fb2814a83d8b 100644
--- a/reference/uodbc/functions/odbc-fetch-object.xml
+++ b/reference/uodbc/functions/odbc-fetch-object.xml
@@ -33,9 +33,12 @@
     <varlistentry>
      <term><parameter>row</parameter></term>
      <listitem>
-      <para>
-       Optionally choose which row number to retrieve.
-      </para>
+      <simpara>
+       The 1-based number of the row to retrieve. If omitted or &null;, the
+       next row of the result set is fetched, as
+       <function>odbc_fetch_row</function> does. If the driver does not
+       support fetching rows by number, this parameter is ignored.
+      </simpara>
      </listitem>
     </varlistentry>
    </variablelist>
@@ -65,7 +68,9 @@
      <row>
       <entry>8.4.0</entry>
       <entry>
-       <parameter>row</parameter> is now nullable.
+       <parameter>row</parameter> is now nullable, and its default value
+       changed from <literal>-1</literal> to &null;, consistent with
+       <function>odbc_fetch_row</function>.
       </entry>
      </row>
     </tbody>