diff --git a/lib/rules/no-unused-vars.js b/lib/rules/no-unused-vars.js
index 4e24720c774..38d121d10b4 100644
--- a/lib/rules/no-unused-vars.js
+++ b/lib/rules/no-unused-vars.js
@@ -669,8 +669,8 @@ module.exports = {
         /**
          * Gets an array of variables without read references.
          * @param {Scope} scope an eslint-scope Scope object.
-         * @param {Variable[]} unusedVars an array containing unused variables that should be reported
-         * @returns {Variable[]} an array containing unused variables of the scope and descendant scopes.
+         * @param {Variable[]} unusedVars an array that saving result.
+         * @returns {Variable[]} unused variables of the scope and descendant scopes.
          * @private
          */
         function collectUnusedVariables(scope, unusedVars) {