note about #226 in readme

diff --git a/README.md b/README.md
index 2d22fb479a1ae0e4ee1ca58225898f3951d5d4d6..6c07a33a0630ef802f628be344da076aeed26cda 100644 (file)
--- a/README.md
+++ b/README.md
@@ -179,6 +179,8 @@ Reveal.addEventListener( 'ready', function( event ) {
 
 An 'slidechanged' event is fired each time the slide is changed (regardless of state). The event object holds the index values of the current slide as well as a reference to the previous and current slide HTML nodes.
 
+Some libraries, like MathJax (see [#226](https://github.com/hakimel/reveal.js/issues/226#issuecomment-10261609)), get confused by the transforms and display states of slides. Often times, this can be fixed by calling their update or render function from this callback.
+
 ```javascript
 Reveal.addEventListener( 'slidechanged', function( event ) {
        // event.previousSlide, event.currentSlide, event.indexh, event.indexv