diff --git a/phpBB/adm/style/acp_posting_buttons.html b/phpBB/adm/style/acp_posting_buttons.html
index 70b6259689..c3c42f8e82 100644
--- a/phpBB/adm/style/acp_posting_buttons.html
+++ b/phpBB/adm/style/acp_posting_buttons.html
@@ -63,6 +63,7 @@
 		<!-- ENDIF -->
 		<!-- ENDIF -->
 	</select>
+	<!-- EVENT acp_posting_buttons_custom_tags_before -->
 	<!-- BEGIN custom_tags -->
 	<input type="button" class="button2" name="addbbcode{custom_tags.BBCODE_ID}" value="{custom_tags.BBCODE_TAG}" onclick="bbstyle({custom_tags.BBCODE_ID})" title="{custom_tags.BBCODE_HELPLINE}" />
 	<!-- END custom_tags -->
diff --git a/phpBB/docs/events.md b/phpBB/docs/events.md
index 60cc4238d5..4903d0dfb2 100644
--- a/phpBB/docs/events.md
+++ b/phpBB/docs/events.md
@@ -343,6 +343,13 @@ acp_posting_buttons_before
 * Since: 3.1.0-b4
 * Purpose: Add content before BBCode posting buttons in the ACP
 
+acp_posting_buttons_custom_tags_before
+===
+* Locations:
+    + adm/style/acp_posting_buttons.html
+* Since: 3.1.10-RC1
+* Purpose: Add content before the custom BBCodes in the ACP
+
 acp_profile_contact_before
 ===
 * Locations: