diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -18,6 +18,8 @@ A network request to a remote server which has a different base domain name than
 
 A 3rd-party exposure score is derived not only from the number of distinct third parties on a web page, but also from the ubiquitousness of each of these distinct third parties.
 
+The ubiquitousness of a specific 3rd party is measured according to how frequently this 3rd party is used on web pages you visit. This means the ubiquitousness of a 3rd party will be representative of your browsing history and whether the 3rd party was blocked or not on the pages you visited. 
+
 ## Status
 
 Early development version. **DO NOT REQUEST FEATURES.**
@@ -107,6 +109,8 @@ For convenience, you can have the heatmap render as a list, where you can see th
 
 ![](https://cloud.githubusercontent.com/assets/585534/23466180/5ec0470e-fe68-11e6-80dd-3abb29545dd3.png)
 
+If you look closely, you will find out that the actual 3rd-party exposure score for the page is the sum of all the ubiquitouness scores of all 3rd parties for which there was a connection on the page. The theoretical (averted) 3rd-party exposure score is the sum of all the ubiquitousness scores of all 3rd parties seen (blocked or not) for the page.
+
 There is also a filter button to filter out all the 3rd parties for which there was no network connection:
 
 ![](https://cloud.githubusercontent.com/assets/585534/23466185/6166a048-fe68-11e6-9407-cb3004573dd6.png)