My Celerio X is making sound while shifting gear

Buying experience of Maruti Celerio X was very good. Driving experience is also very good. It is very comfortable to drive in city as well as in high road. Looks and interior space is good. Body parts are not so strong. After a run of 4000km I can hear a sound ( tik tik tik) while shifting the gear down. This sound was not preset previously. I am worried after getting this sound within this short period of time.