diff --git a/modules/luci-mod-admin-full/luasrc/view/admin_system/flashops.htm b/modules/luci-mod-admin-full/luasrc/view/admin_system/flashops.htm
index 3e3f65d919..b32ef78263 100644
--- a/modules/luci-mod-admin-full/luasrc/view/admin_system/flashops.htm
+++ b/modules/luci-mod-admin-full/luasrc/view/admin_system/flashops.htm
@@ -54,6 +54,9 @@
 				</div>
 			</form>
 		</div>
+		<% if reset_avail then %>
+		<div class="alert-message warning"><%:Custom files (certificates, scripts) may remain on the system. To prevent this, perform a factory-reset first.%></div>
+		<% end %>
 	</fieldset>
 
 	<br />