fix persisting explanation

README.md

@@ -70,11 +70,8 @@ The bookmarklet also outputs various console tables ([where supported](https://d
 
 ![alt text](https://raw.githubusercontent.com/micmro/resourceTable/gh-pages/readme-assets/perfbook-tables-resources.png "tabular output in console of all resources in the page")
 
-Various page metrics are persisted between page refreshes. This data can be accessed through the console via ```PerformanceBookmarklet.PageMetric.dump(delimiter, clear)```.
+Various page metrics can be persisted between page refreshes and later displayed in the console, when ticking the `Persist Data?` checkbox.
 
-Default values:
-* delimiter: ```"\t"``` 
-* clear: ```true```
 
 How to use this snippet
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