diff --git a/demo/binary_classification/mushroom.conf b/demo/binary_classification/mushroom.conf
index 6527832f8..596857aee 100644
--- a/demo/binary_classification/mushroom.conf
+++ b/demo/binary_classification/mushroom.conf
@@ -23,5 +23,7 @@ save_period = 0
 data = "agaricus.txt.train" 
 # The path of validation data, used to monitor training process, here [test] sets name of the validation set
 eval[test] = "agaricus.txt.test" 
+# evaluate on training data as well each round
+eval_train = 1
 # The path of test data 
 test:data = "agaricus.txt.test"