diff --git a/examples/other/g2p/compare_badcase.py b/examples/other/g2p/compare_badcase.py
index a4a78a23f10365f9cb920f9efd1f0b4f195922a0..d762459c352de099f3ae018282eb67a3dc2fbb96 100644
--- a/examples/other/g2p/compare_badcase.py
+++ b/examples/other/g2p/compare_badcase.py
@@ -9,6 +9,9 @@ so you may get test result ( exp/g2p )into two directories, as exp/prefolder and
 run this program as  "python compare_badcase.py prefolder curfolder"
 then you will get diffrences between two run, uuid, phonetics, chinese samples
 
+examples: python compare_badcase.py  exp/g2p_laotouzi  exp/g2p
+in this example:  exp/g2p_laotouzi  and  exp/g2p  are two folders with two g2p tests result
+
 '''