diff --git a/lib/jsduck/options.rb b/lib/jsduck/options.rb
index 628e2ec967b4ef01ea5f78076be76664127eda99..446b788618a645f895bbba565243a4c6fb02a76f 100644
--- a/lib/jsduck/options.rb
+++ b/lib/jsduck/options.rb
@@ -726,7 +726,7 @@ module JsDuck
           "be cleaned up during docs generation, and the caching",
           "won't work.",
           "",
-          "This option only has an effect when --cache is also used.",) do |path|
+          "This option only has an effect when --cache is also used.") do |path|
           @cache_dir = path
         end