improve comments

src/scriptlets/trusted-click-element.js

@@ -117,6 +117,9 @@ export function trustedClickElement(source, selectors, delay, extraMatch = '') {
     /**
      * Create selectors array and swap selectors to null on finding corresponding element
      *
+     * Selectors stubs should not be removed from array to keep track of elements order
+     * and to always know on what index corresponding element should be put
+     *
      * null values allow to keep the sequence in order
      * and prevent selectors from being queried multiple times
      */
@@ -127,6 +130,9 @@ export function trustedClickElement(source, selectors, delay, extraMatch = '') {
     /**
      * Array of element structures to keep found elements until they are eligible
      * to being clicked by delay and/or click order and allow skipping clicked elements
+     *
+     * Elements stubs should not be removed from array to keep track
+     * of their order and  clicked 'state'
      */
     const elementStruct = {
         element: undefined,