Explain issue #11 caveat and solutions in README

README.md

@@ -33,6 +33,34 @@ To exchange two words, place your cursor on the first word and type `cxiw`.
 Then move to the second word and type `cxiw` again. Note: the {motion} used in
 the first and second use of `cx` don't have to be the same.
 
+Caveats
+-------
+
+### Visual mapping causes delay for change operator
+
+As noted in [Issue #11][iss11], the visual mapping for `cx` can cause a delay
+if you want to use `c` from visual mode. This is because Vim is waiting for a
+delay (specified by `'timeoutlen'`) before using the `c` command instead of
+using `cx`.  For more details, see [:help 'timeoutlen'][timeoutlen].
+
+There are two potential solutions for this.
+
+#### Changing timeout length
+
+Set `'timeoutlen'` to a smaller value so that the delay is less noticeable.
+
+    set timeoutlen=250
+
+#### Changing default visual mapping
+
+Change the default visual mapping to something that doesn't begin with `c` (or
+any other existing operator).
+
+    vmap <Leader>cx <Plug>Exchange
+
+[iss11]: https://github.com/tommcdo/vim-exchange/issues/11
+[timeoutlen]: http://vimdoc.sourceforge.net/htmldoc/options.html#'timeoutlen'
+
 Installation
 ------------