diff --git a/src/main/resources/com/ardublock/reference/404.html b/src/main/resources/com/ardublock/reference/404.html
new file mode 100644
index 0000000000000000000000000000000000000000..643ff52ed36f20311dba4907ec8fe40548f74ee5
--- /dev/null
+++ b/src/main/resources/com/ardublock/reference/404.html
@@ -0,0 +1,4 @@
+<html>
+<font  size=+3 color=red>not found</font>
+</html>
+