diff --git a/src/js/theme/sidebar.js b/src/js/theme/sidebar.js
index 18729c90..d7f3a41f 100644
--- a/src/js/theme/sidebar.js
+++ b/src/js/theme/sidebar.js
@@ -4,7 +4,7 @@ var platform = require('./platform');
 
 var gitbook = window.gitbook;
 
-// Toggle sidebar with or withour animation
+// Toggle sidebar with or without animation
 function toggleSidebar(_state, animation) {
     if (gitbook.state != null && isOpen() == _state) return;
     if (animation == null) animation = true;