diff --git a/examples/iwslt2012/punc0/conf/default.yaml b/examples/iwslt2012/punc0/conf/default.yaml
index 74ced99327b38dff4863718b75a7bff8096061c1..4e2c50a55758493b72e97416f346fca6089dde4a 100644
--- a/examples/iwslt2012/punc0/conf/default.yaml
+++ b/examples/iwslt2012/punc0/conf/default.yaml
@@ -29,7 +29,7 @@ optimizer_params:
 
 scheduler_params:
     learning_rate: 1.0e-5               # learning rate.
-    gamma: 1.0                          # scheduler gamma.
+    gamma: 1.0                          # scheduler gamma must between(0.0, 1.0) and close to 1.0 is better.
 
 ###########################################################
 #                     TRAINING SETTING                    #