PokéBase - Pokémon Q&A
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Same-type attack bonus, commonly abbreviated as STAB, is a 50% boost to the power of an attack when the attack is the same type as one of the types of the Pokémon using the attack. This results in a 50% increase in damage (100% if the Pokémon has the Adaptability Ability.)

Same-type attack bonus does not apply to moves that do a set amount of damage nor ones that do not use the normal damage formula, such as Dragon Rage and Seismic Toss.

Source: Bulbapedia's STAB page

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No worries.
Like grass Knot, right?
Grass Knot gets STAB, because the damage is not set; it can also be powered up by moves like Swords Dance or Calm Mind.