adding notes about synchronous methods in readme

readme.md

@@ -244,6 +244,10 @@ nodehun.createNewNodehun(affbuf,dictbuf,function(err,dict){
 });
 ```
 
+A Warning on Synchronous Methods
+-----------------------------
+There are synchronous versions of all the methods listed above, but they are not doucmented as they are only present for people who really know and understand what they are doing. I highly recommend looking at the C++ source code if you are going to use these methods in a production environment as the locks involved with them can create some counterintuitive situations. For example, if you were to remove a word synchronously while many different suggestion threads were working in the backgound the remove word method could take seconds to complete while it waits to take control of the read-write lock. This is obviously disastrous in a situation where you would be servicing many requests.
+
 A Note About Open Office Dictionaries
 -------------------------------------
 All files must be UTF-8 to work! When you download [open office dictionaries](http://cgit.freedesktop.org/libreoffice/dictionaries/tree/) don't assume that the file is UTF-8 just because it is being served as a UTF-8 file. You may have to convert the file using the `iconv` unix utility (easy enough to do) to UTF-8 in order for the files to work.