After roots meaning 'to wish' the liṅ (Benedictive) is optionally used denoting the present time.,
This ordains लिङ् where there would have been otherwise लट्. Thus इच्छति or इच्छेत् 'he wishes'; वष्टि or उश्यात्; कामयते or कामयेत ।,
इच्छार्थेभ्यो विभाषा वर्तमाने
Adhyāya 3 · Pāda 3 · Rule 160