diff --git a/README.md b/README.md
index f4eaa91..01a4ff1 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ list:
 }
 ```
 
-The `170px` reserves room for the page header, the board column header, the horizontal
+The `240px` reserves room for the page header, the board column header, the horizontal
 scrollbar, and a little breathing space. A fixed-pixel budget is more reliable than a
 proportional value because that chrome is a fixed height regardless of screen size.