Update zhihuexpand.html

zhihuexpand.html

@@ -1,4 +1,4 @@
-<a href="javascript:(function(){
+1. drag this link <a href="javascript:(function(){
     function zhexpandall(){
         var expandbtns = document.querySelectorAll('a.toggle-expand');
         for(var i = 0; i < expandbtns.length; i++){ expandbtns[i].click(); }
@@ -12,4 +12,8 @@
         }
     }
     zhexpandall();
-})()">zhexpand!</a>
+})()">zhexpand!</a> to your bookmark bar. feel free to rename it.
+<br>
+2. go into a <em>single</em> question and click the bookmark.
+<br>
+What it does: it should click 更多 every 3 sec untill the button disappears, and expand all collapsed answers. If the process stops for some reason, just click the bookmark again.