diff --git a/phpBB/docs/INSTALL.html b/phpBB/docs/INSTALL.html
index 853607886b..4f7f07d3dc 100644
--- a/phpBB/docs/INSTALL.html
+++ b/phpBB/docs/INSTALL.html
@@ -147,7 +147,7 @@
 			<li>Oracle</li>
 		</ul>
 		</li>
-		<li><strong>PHP 5.4.7+</strong> with support for the database you intend to use.</li>
+		<li><strong>PHP 5.4.7+</strong> but less than <strong>PHP 7.3</strong> with support for the database you intend to use.</li>
 		<li>The following PHP modules are required:
 		<ul>
 			<li>json</li>