Shiva Purana
तन्मस्तकस्थं बिंदुं च तदूर्द्ध्वं नादमालिखेत् ॥ यंत्रे संपूर्णतां याति सर्वकामः प्रसिध्यति ॥ १७ ॥
The dot on the head of the demon should be drawn with the sound above it All desires are fulfilled in the instrument.
english translation
tanmastakasthaM biMduM ca tadUrddhvaM nAdamAlikhet ॥ yaMtre saMpUrNatAM yAti sarvakAmaH prasidhyati ॥ 17 ॥
hk transliteration by Sanscript