Dipole-bound and valence-bound anions of thymine were characterised by 
means of state-of-the-art ab initio calculations. The dipole-bound anion 
of thymine is both vertically and adiabatically stable with adiabatic 
electron affinity of 51 meV. The valence-bound anion is also adiabatically
stable, albeit less than the dipole-bound anion. Its adiabatic electron 
affinity is only 30 meV, however, its vertical stability of 553 meV higher 
than that of the dipole-bound anion. All these values agree well with 
experimental findings.