diff --git a/phpBB/adm/style/acp_ext_details.html b/phpBB/adm/style/acp_ext_details.html
index 465a89e17a..bd9eca623a 100644
--- a/phpBB/adm/style/acp_ext_details.html
+++ b/phpBB/adm/style/acp_ext_details.html
@@ -21,6 +21,7 @@
 		<p>{VERSIONCHECK_FAIL_REASON}</p>
 	</div>
 	<!-- ENDIF -->
+<!-- EVENT acp_ext_details_notice -->
 
 	<fieldset>
 		<legend>{L_EXT_DETAILS}</legend>
diff --git a/phpBB/docs/events.md b/phpBB/docs/events.md
index 94090b19d1..afe8141916 100644
--- a/phpBB/docs/events.md
+++ b/phpBB/docs/events.md
@@ -64,6 +64,12 @@ acp_ext_details_end
 * Since: 3.1.11-RC1
 * Purpose: Add more detailed information on extension after the available information.
 
+acp_ext_details_notice
+===
+* Location: adm/style/acp_ext_details.html
+* Since: 3.1.11-RC1
+* Purpose: Add extension detail notices after version check information.
+
 acp_ext_list_disabled_name_after
 ===
 * Location: adm/style/acp_ext_list.html