diff --git a/README.md b/README.md
index 6c07a33..0d6e3ac 100644
--- a/README.md
+++ b/README.md
@@ -93,6 +93,8 @@ Reveal.initialize({
 });
 ```
 
+Note that the new default vertical centering option will break compatibility with slides that were using transitions with backgrounds (`cube` and `page`). To restore the previous behavior, set `center` to `false`.
+
 ### Dependencies
 
 Reveal.js doesn't _rely_ on any third party scripts to work but a few optional libraries are included by default. These libraries are loaded as dependencies in the order they appear, for example: