diff --git a/src/types/Modifier.ts b/src/types/Modifier.ts
index a8b93f1..10a70d1 100644
--- a/src/types/Modifier.ts
+++ b/src/types/Modifier.ts
@@ -8,6 +8,8 @@ interface Modifier<T extends string, V> {
 interface ColorGenericModifier<T extends ColorModifierTypes, V> extends Modifier<T, V> {
   space: ColorSpaceTypes;
   format: string;
+  mathFractionDigits?: number;
+  precision?: number;
 }
 
 export type LightenModifier = ColorGenericModifier<ColorModifierTypes.LIGHTEN, string>;