diff --git a/doc/autoscale_experiment.md b/doc/autoscale_experiment.md
index 3889630e..9b85b4cb 100644
--- a/doc/autoscale_experiment.md
+++ b/doc/autoscale_experiment.md
@@ -14,6 +14,7 @@
 
 ## Before Starting The Experiment
 
+- All the demos in [book](https://github.com/PaddlePaddle/book) should be tested.
 - We will use [recognize_digits](https://github.com/PaddlePaddle/cloud/tree/develop/demo/recognize_digits) as the training job for the demo.
 - We have 240 CPU cores and 80 GPU cards totally.