diff --git a/reference/pdo_sqlite/PDO/sqliteCreateFunction.xml b/reference/pdo_sqlite/PDO/sqliteCreateFunction.xml
index 976319a925..7e2e8c57c0 100644
--- a/reference/pdo_sqlite/PDO/sqliteCreateFunction.xml
+++ b/reference/pdo_sqlite/PDO/sqliteCreateFunction.xml
@@ -14,7 +14,7 @@
    <modifier>public</modifier> <type>bool</type><methodname>PDO::sqliteCreateFunction</methodname>
    <methodparam><type>string</type><parameter>function_name</parameter></methodparam>
    <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>num_args</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>num_args</parameter><initializer>-1</initializer></methodparam>
    <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>0</initializer></methodparam>
   </methodsynopsis>
   &warn.experimental.func;
@@ -60,8 +60,9 @@
      <term><parameter>num_args</parameter></term>
      <listitem>
       <para>
-       Hint to the SQLite parser if the callback function accepts a
-       predetermined number of arguments.
+       The number of arguments that the SQL function takes. If
+       this parameter is <literal>-1</literal>, then the SQL function may take
+       any number of arguments.
       </para>
      </listitem>
     </varlistentry>
diff --git a/reference/sqlite3/sqlite3/createfunction.xml b/reference/sqlite3/sqlite3/createfunction.xml
index 2aa8b969f8..acbc86fa0d 100644
--- a/reference/sqlite3/sqlite3/createfunction.xml
+++ b/reference/sqlite3/sqlite3/createfunction.xml
@@ -48,7 +48,7 @@
      <listitem>
       <para>
        The number of arguments that the SQL function takes. If
-       this parameter is negative, then the SQL function may take
+       this parameter is <literal>-1</literal>, then the SQL function may take
        any number of arguments.
       </para>
      </listitem>