diff --git a/lib/index.js b/lib/index.js
index 63cf924..6601a35 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -36,7 +36,7 @@ function extendedBin(baseUrl, hugoVersion) {
 
 /**
  * @param {string} baseUrl
- * @param {string} [hugoVersion]
+ * @param {string} hugoVersion
  */
 function normalBin(baseUrl, hugoVersion) {
   return new BinWrapper()