diff --git a/dist/midori.d.ts b/dist/midori.d.ts
index b284cdd..393db44 100644
--- a/dist/midori.d.ts
+++ b/dist/midori.d.ts
@@ -363,6 +363,7 @@ export interface ParticleGroupConfig {
 	minOpacity?: number;
 	maxOpacity?: number;
 	color?: number;
+	smoothing?: number;
 }
 export declare class Particles {
 	private _width;
@@ -433,9 +434,10 @@ export declare class Particles {
 	sway(name: string, offset: ParticleSwayOffset | boolean, transition?: LoopableTransitionConfig): void;
 	/**
 	 * Generates a new random averaged value based off a given value and its range.
-	 * @param {number} value - the value to use.
+	 * @param {number} prevValue - the previous value.
 	 * @param {number} minValue - the minimum value for the given value.
 	 * @param {number} maxValue - the maximum value for the given value.
+	 * @param {number} smoothing - optional amount of smoothing to use as a value between 0 and 1. Defaults to 0.5.
 	 * @returns number
 	 */
 	private _generateNewRandomAveragedValue;
diff --git a/src/effects/particles.ts b/src/effects/particles.ts
index 7ca2c7c..b6ee290 100644
--- a/src/effects/particles.ts
+++ b/src/effects/particles.ts
@@ -39,7 +39,7 @@ export interface ParticleGroupConfig {
   // optional color of the particles. Defaults to 0xffffff.
   color?: number;
   // the amount of smoothing for animated values (i.e size, gradient, opacity), specified as a value between 0 and 1. Defaults to 0.5.
-  smoothing?: number
+  smoothing?: number;
 }
 
 type ParticleGroupMap = {[name: string]: ParticleGroup};
@@ -363,7 +363,7 @@ class Particles {
    * @param {number} smoothing - optional amount of smoothing to use as a value between 0 and 1. Defaults to 0.5.
    * @returns number
    */
-  private _generateNewRandomAveragedValue(prevValue: number, minValue: number, maxValue: number, smoothing: number = 0.5): number {
+  private _generateNewRandomAveragedValue(prevValue: number, minValue: number, maxValue: number, smoothing = 0.5): number {
     // cap smoothing at 0.95
     smoothing = Math.min(smoothing, 0.95);
     const offset = (maxValue - minValue) / 2;