diff --git a/static/js/cours.js b/static/js/cours.js
index 721b23f..5f539a9 100644
--- a/static/js/cours.js
+++ b/static/js/cours.js
@@ -1,3 +1,10 @@
+/**
+ * Clean URLs from anchors
+ * @param {string} url Link URL
+ * @returns Link URL cleaned
+ */
+const cleanURL = (url) => url.split("#")[0];
+
 /**
  * Build the filetree
  * @param {HTMLElement} parent Root element of the filetree
@@ -30,7 +37,7 @@ const buildFileTree = (parent, data, location) => {
       );
     } else {
       // File
-      const url = window.location.href.split("?")[0];
+      const url = cleanURL(window.location.href).split("?")[0];
       const a = document.createElement("a");
       a.text = item.name;
       a.href = `${url}?q=${location}${item.name}`;
@@ -66,7 +73,7 @@ const uncollapse = (element) => {
  * 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
+ * @returns The deepest node
  */
 const deepestNodeOpened = (path, options) => {
   if (path[0] === "") {
@@ -91,6 +98,12 @@ const deepestNodeOpened = (path, options) => {
   }
 };
 
+/**
+ * Search in the filetree, when nothing is aske, returns to initial state
+ * @param {string} query Query
+ * @param {HTMLElement} parent Filetree
+ * @param {HTMLLIElement} currentFile Current file opened
+ */
 const searchFiles = (query, parent, currentFile) => {
   // Prevent blocking the main thread
   requestAnimationFrame(() => {
@@ -136,7 +149,7 @@ window.addEventListener("load", () => {
   dataElement.remove();
 
   // Open nested openeded directories
-  const infoURL = window.location.href.split("?");
+  const infoURL = cleanURL(window.location.href).split("?");
   const fullpath = infoURL.length > 1 ? infoURL[1].substring(2) : "index.md";
   const path = fullpath.substring(0, fullpath.lastIndexOf("/"));