diff --git a/src/ColumnsBlock/ColumnsBlockEdit.jsx b/src/ColumnsBlock/ColumnsBlockEdit.jsx
index b7e9e6f..2769026 100644
--- a/src/ColumnsBlock/ColumnsBlockEdit.jsx
+++ b/src/ColumnsBlock/ColumnsBlockEdit.jsx
@@ -208,6 +208,7 @@ class ColumnsBlockEdit extends React.Component {
     // }}
     return (
       <div role="presentation" className="columns-block">
+        {data.coldata ? 'old style columns block, safe to remove it' : ''}
         {Object.keys(data).length === 1 ? (
           <ColumnVariations
             variants={variants}