diff --git a/bezier.js b/bezier.js
index 25008dc..db20c12 100644
--- a/bezier.js
+++ b/bezier.js
@@ -1,3 +1,7 @@
+// Author: https://github.com/Pomax
+// License: MIT
+// Source: https://github.com/Pomax/bezierjs/blob/master/src/utils.js
+
 // math-inlining.
 const { abs, cos, sin, acos, atan2, sqrt, pow } = Math;
 
@@ -409,7 +413,7 @@ const utils = {
       (p1.x + p2.x) / 2,
       (p1.y + p2.y) / 2,
       p2.x,
-      p2.y
+      p2.y,
     );
   },
 
@@ -436,7 +440,7 @@ const utils = {
     bbox1,
     s2,
     bbox2,
-    curveIntersectionThreshold
+    curveIntersectionThreshold,
   ) {
     if (!utils.bboxoverlap(bbox1, bbox2)) return [];
     const intersections = [];
@@ -477,7 +481,7 @@ const utils = {
         shape.bbox,
         s2,
         s2.bbox,
-        curveIntersectionThreshold
+        curveIntersectionThreshold,
       );
     };
     return shape;
@@ -678,7 +682,7 @@ const utils = {
       num = sqrt(
         pow(d.y * dd.z - dd.y * d.z, 2) +
           pow(d.z * dd.x - dd.z * d.x, 2) +
-          pow(d.x * dd.y - dd.x * d.y, 2)
+          pow(d.x * dd.y - dd.x * d.y, 2),
       );
       dnm = pow(qdsum + d.z * d.z, 3 / 2);
     } else {
@@ -823,7 +827,7 @@ const utils = {
 
     pairs.forEach(function (pair) {
       results = results.concat(
-        utils.pairiteration(pair.left, pair.right, threshold)
+        utils.pairiteration(pair.left, pair.right, threshold),
       );
     });
 
@@ -976,7 +980,15 @@ class PolyBezier {
 **/
 
 // math-inlining.
-const { abs: abs$1, min, max, cos: cos$1, sin: sin$1, acos: acos$1, sqrt: sqrt$1 } = Math;
+const {
+  abs: abs$1,
+  min,
+  max,
+  cos: cos$1,
+  sin: sin$1,
+  acos: acos$1,
+  sqrt: sqrt$1,
+} = Math;
 const pi$1 = Math.PI;
 
 /**
@@ -1010,7 +1022,7 @@ class Bezier {
       if (coordlen > 4) {
         if (arguments.length !== 1) {
           throw new Error(
-            "Only new Bezier(point[]) is accepted for 4th and higher order curves"
+            "Only new Bezier(point[]) is accepted for 4th and higher order curves",
           );
         }
         higher = true;
@@ -1019,7 +1031,7 @@ class Bezier {
       if (len !== 6 && len !== 8 && len !== 9 && len !== 12) {
         if (arguments.length !== 1) {
           throw new Error(
-            "Only new Bezier(point[]) is accepted for 4th and higher order curves"
+            "Only new Bezier(point[]) is accepted for 4th and higher order curves",
           );
         }
       }
@@ -1049,7 +1061,8 @@ class Bezier {
     // is this curve, practically speaking, a straight line?
     const aligned = utils.align(points, { p1: points[0], p2: points[order] });
     const baselength = utils.dist(points[0], points[order]);
-    this._linear = aligned.reduce((t, p) => t + abs$1(p.y), 0) < baselength / 50;
+    this._linear =
+      aligned.reduce((t, p) => t + abs$1(p.y), 0) < baselength / 50;
 
     this._lut = [];
 
@@ -1454,7 +1467,7 @@ class Bezier {
           return t >= 0 && t <= 1;
         });
         roots = roots.concat(result[dim].sort(utils.numberSort));
-      }.bind(this)
+      }.bind(this),
     );
 
     result.values = roots.sort(utils.numberSort).filter(function (v, idx) {
@@ -1470,7 +1483,7 @@ class Bezier {
     this.dims.forEach(
       function (d) {
         result[d] = utils.getminmax(this, d, extrema[d]);
-      }.bind(this)
+      }.bind(this),
     );
     return result;
   }
@@ -1604,7 +1617,7 @@ class Bezier {
       this.points.map((p, i) => ({
         x: p.x + v.x * d[i],
         y: p.y + v.y * d[i],
-      }))
+      })),
     );
   }
 
@@ -1627,7 +1640,7 @@ class Bezier {
       return this.translate(
         this.normal(0),
         distanceFn ? distanceFn(0) : d,
-        distanceFn ? distanceFn(1) : d
+        distanceFn ? distanceFn(1) : d,
       );
     }
 
@@ -1742,10 +1755,10 @@ class Bezier {
       const slen = segment.length();
       if (graduated) {
         fcurves.push(
-          segment.scale(linearDistanceFunction(d1, d3, tlen, alen, slen))
+          segment.scale(linearDistanceFunction(d1, d3, tlen, alen, slen)),
         );
         bcurves.push(
-          segment.scale(linearDistanceFunction(-d2, -d4, tlen, alen, slen))
+          segment.scale(linearDistanceFunction(-d2, -d4, tlen, alen, slen)),
         );
       } else {
         fcurves.push(segment.scale(d1));
@@ -1787,7 +1800,7 @@ class Bezier {
       const shape = utils.makeshape(
         outline[i],
         outline[len - i],
-        curveIntersectionThreshold
+        curveIntersectionThreshold,
       );
       shape.startcap.virtual = i > 1;
       shape.endcap.virtual = i < len / 2 - 1;
@@ -1807,7 +1820,7 @@ class Bezier {
     return this.curveintersects(
       this.reduce(),
       curve,
-      curveIntersectionThreshold
+      curveIntersectionThreshold,
     );
   }
 
@@ -1856,7 +1869,7 @@ class Bezier {
       const result = utils.pairiteration(
         pair.left,
         pair.right,
-        curveIntersectionThreshold
+        curveIntersectionThreshold,
       );
       if (result.length > 0) {
         intersections = intersections.concat(result);
@@ -1970,4 +1983,4 @@ class Bezier {
   }
 }
 
-module.exports = Bezier;
\ No newline at end of file
+module.exports = Bezier;