diff --git a/lang/en/install.php b/lang/en/install.php
index 53862985934..e3085a15c35 100644
--- a/lang/en/install.php
+++ b/lang/en/install.php
@@ -172,11 +172,13 @@ $string['mysqliextensionisnotpresentinphp'] = 'PHP has not been properly configu
 $string['nativemariadb'] = 'MariaDB (native/mariadb)';
 $string['nativemariadbhelp'] = '<p>The database is where most of the Moodle settings and data are stored and must be configured here.</p>
 <p>The database name, username, and password are required fields; table prefix is optional.</p>
+<p>The database name may contain only alphanumeric characters, dollar ($) and underscore (_).</p>
 <p>If the database currently does not exist, and the user you specify has permission, Moodle will attempt to create a new database with the correct permissions and settings.</p>
 <p>This driver is not compatible with legacy MyISAM engine.</p>';
 $string['nativemysqli'] = 'Improved MySQL (native/mysqli)';
 $string['nativemysqlihelp'] = '<p>The database is where most of the Moodle settings and data are stored and must be configured here.</p>
 <p>The database name, username, and password are required fields; table prefix is optional.</p>
+<p>The database name may contain only alphanumeric characters, dollar ($) and underscore (_).</p>
 <p>If the database currently does not exist, and the user you specify has permission, Moodle will attempt to create a new database with the correct permissions and settings.</p>';
 $string['nativemssql'] = 'SQL*Server FreeTDS (native/mssql)';
 $string['nativemssqlhelp'] = 'Now you need to configure the database where most Moodle data will be stored.