1 files changed, 4 insertions, 1 deletions

diff --git a/src/dumbymap.mjs b/src/dumbymap.mjs
index dd96437..b1ba0c9 100644
--- a/src/dumbymap.mjs
+++ b/src/dumbymap.mjs
@@ -270,16 +270,19 @@ export const generateMaps = async (container, callback) => {
         resume: true
       })
     } else if (showcase.contains(target)) {
+      // Check placeholder is inside Semantic HTML
       const placeholder = htmlHolder.querySelector(`[data-placeholder="${target.id}"]`)
       if (!placeholder) throw Error(`Cannot fine placeholder for map "${target.id}"`)
+
+      // animation from Showcase to placeholder
       const animation = animateRectTransition(target, placeholder.getBoundingClientRect(), { duration: 300 })
 
+      // Consider animation may fail, write callback
       const afterAnimation = () => {
         placeholder.parentElement.replaceChild(target, placeholder)
         target.style = placeholder.style.cssText
         placeholder.remove()
       }
-
       if (animation) {
         animation.finished
           .then(afterAnimation)