Grenade kills leave no message

How can I add these?
Also some melee weapons won't be shown.

Oh. Is this cause I left out explosions?
I don't want everyone to notice who is using C4 and is doing it wrong.
That's why I left out explosions.
But I would find it great to have messages for players who kill others with an F1 grenade.
Velocity Rockets are being shown in death notes btw.
Isn't this handled with damage type explosions too?