diff --git a/src/index.html b/src/index.html
index 95e6e61..fd2f124 100644
--- a/src/index.html
+++ b/src/index.html
@@ -34,6 +34,14 @@
 						<h2 id="lesson-title"></h2>
 						<div class="task-instruction" id="task-instruction"></div>
 						<div class="lesson-description" id="lesson-description"></div>
+						<details class="concept-section" id="concept-section">
+							<summary class="concept-summary" data-i18n="whyThisWorks">Why This Works</summary>
+							<div class="concept-content">
+								<div class="concept-explanation" id="concept-explanation"></div>
+								<div class="concept-diagram" id="concept-diagram"></div>
+								<div class="concept-container-vs-item" id="concept-container-vs-item"></div>
+							</div>
+						</details>
 					</section>
 
 					<section class="editor-section">