diff --git a/README.md b/README.md
index 885f405..77c3800 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
 Works only in Gecko 20.0 and higher because used API doesn't exist in older versions!
 
 #### Known issues:
-We just inherit private state from selected tab and tries preserve private state of dropped link-like things, this is simple to implement, but may confuse a bit…
+* We just inherit private state from selected tab and tries preserve private state of dropped link-like things, this is simple to implement, but may confuse a bit…
+* If you use "New Private Tab" + "New Tab" buttons after tabs toolbar, you need to manually remove "New Private Tab" button before disabling or uninstalling Private Tab. Or you can remove "New Tab" button, press OK in Customize Toolbar dialog and then place "New Tab" directly after tabs.
 
 #### Styles:
 You can use `.tabbrowser-tab[privateTab-isPrivate]` (private tab) and `#main-window[privateTab-isPrivate]` (built-in private window) selectors in styles for <a href="http://kb.mozillazine.org/UserChrome.css">userChrome.css</a>/<a href="https://addons.mozilla.org/addon/stylish/">Stylish</a>.