Eternal hope and d20 reroll question.

[FallzQuick]

Eternal Hope

Gnomes rarely lose hope and are always confident that even hopeless situations will work out. Gnomes with this racial trait receive a +2 racial bonus on saving throws against fear and despair effects. Once per day, after rolling a 1 on a d20, the gnome may reroll and use the second result. This racial trait replaces defensive training and hatred.

Does the d20 reroll work on any d20? saving throw, attack, ect?

[Dave Justus]

yes