diff --git a/README.md b/README.md
index 4d03872..d1bf46b 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ toggle: function() {
 }
 ```
 
-`iron-collapse` adjusts the height/width of the collapsible element to show/hide
+`iron-collapse` adjusts the max-height/max-width of the collapsible element to show/hide
 the content.  So avoid putting padding/margin/border on the collapsible directly,
 and instead put a div inside and style that.