diff --git a/docs/kerneltest/continue_from_v2.rst b/docs/kerneltest/continue_from_v2.rst
index b91c7d3..2a147c7 100644
--- a/docs/kerneltest/continue_from_v2.rst
+++ b/docs/kerneltest/continue_from_v2.rst
@@ -57,3 +57,4 @@ The Bad points
 --------------
 
 1. Make familiar with existing code = more time needed
+2. Data migration will be difficult, because the db schema is too different from 1.2