diff --git a/src/voronoi.js b/src/voronoi.js
index d179df7..97d388b 100644
--- a/src/voronoi.js
+++ b/src/voronoi.js
@@ -278,10 +278,8 @@ export default class Voronoi {
         case 0b1001: e0 = 0b0001; continue; // bottom-left
         case 0b0001: e0 = 0b0101, x = this.xmin, y = this.ymin; break; // left
       }
-
-      // Implicit out of bounds checking.
-      // P[j] or P[j+1] may become undefined and the conditional statement will be
-      // executed.
+      // Note: this implicitly checks for out of bounds: if P[j] or P[j+1] are
+      // undefined, the conditional statement will be executed.
       if ((P[j] !== x || P[j + 1] !== y) && this.contains(i, x, y)) {
         P.splice(j, 0, x, y), j += 2;
       }