diff --git a/static/js/cours.js b/static/js/cours.js
index 2d0c747..a98a7af 100644
--- a/static/js/cours.js
+++ b/static/js/cours.js
@@ -44,6 +44,45 @@ const buildFileTree = (parent, data, location) => {
   parent.appendChild(ul);
 };
 
+/**
+ * Uncollapse elements from the deepest element
+ * @param {HTMLLIElement} element Element to uncollapse
+ */
+const uncollapse = (element) => {
+  if (element) {
+    element.classList.remove("collapsed");
+    uncollapse(element.parentElement.closest("li"));
+  }
+};
+
+/**
+ * Find the deepest opened directory
+ * @param {string[]} path Current path we are looking at, init with fullpath
+ * @param {NodeListOf<ChildNode>} options Options we have, init with list root
+ * @returns
+ */
+const deepestNodeOpened = (path, options) => {
+  // Iterate over possible options
+  for (let i = 0; i < options.length; ++i) {
+    // If the directory and the current path match
+    if (path[0] === options[i].firstChild.nodeValue) {
+      if (path.length === 1) {
+        // We found it
+        return options[i];
+      }
+
+      // Continue the search
+      let returned_value = deepestNodeOpened(
+        path.slice(1),
+        options[i].querySelector("ul").childNodes
+      );
+      if (returned_value) {
+        return returned_value;
+      }
+    }
+  }
+};
+
 window.addEventListener("load", () => {
   // Build the filetree
   const fileTreeElement = document.getElementsByTagName("aside")[0];
@@ -55,4 +94,14 @@ window.addEventListener("load", () => {
     ""
   );
   dataElement.remove();
+
+  // Open nested openeded directories
+  const fullpath = window.location.href.split("?")[1].substring(2);
+  const path = fullpath.substring(0, fullpath.lastIndexOf("/"));
+  const last_openeded = deepestNodeOpened(
+    path.split("/"),
+    fileTreeElement.querySelector("ul").childNodes
+  );
+
+  uncollapse(last_openeded);
 });