diff --git a/js/utils.js b/js/utils.js
index a944396562f8832320bd9609547c32ece686f0a2..2026efe2e9c794e6c0fb3abed122be3709f2735c 100644
--- a/js/utils.js
+++ b/js/utils.js
@@ -400,6 +400,7 @@ function deepAssign(target, source) {
  * For more information about mean vs. median see
  * https://www.clinfo.eu/mean-median/
  * @param {number[]} arr Does not need to be sorted
+ * @returns {number}
  */
 function median(arr = []) {
 	const