Update README

Author: github-antoine-barrault

README.md

@@ -131,18 +131,21 @@ extension <#YOURViewController#>: TeadsInReadAdPlacementDelegate {
     }
 
     func adOpportunityTrackerView(trackerView: TeadsAdOpportunityTrackerView) {
-        <#your_ad_container_view#>.addSubview(trackerView)
+        <#your_ad_container_view#>.addSubview(trackerView)  // See TeadsAdOpportunityTrackerView documentation for more information
     }
 
 }
 ```
 
-#### adOpportunityTrackerView
+#### TeadsAdOpportunityTrackerView
 
-The adOpportunityTrackerView is a view that you will need to add to your slot view. You should add it in the origin of your slot (x: 0, y: 0) 
-Its function is to monitor the inventory.
+The `TeadsAdOpportunityTrackerView` is a view that you will need to add to your slot view *(e.g. the view where you will display the ad)*. 
+This view will be provided during the ad request process and will allow Teads to monitor precisely ad opportunities on [**Teads for Publisher**](https://publishers.teads.tv/).
 
-Once the TeadsAdOpportunityTrackerView is visible, it will automatically removed. 
+You should add it where the ad will be displayed, even if you don't received an ad from our SDK. 
+This view needs to be at the origin of your ad slot `(x:0, y:0)`.
+
+Once the `TeadsAdOpportunityTrackerView` is visible, it will be automatically removed by the SDK. 
 
 ```swift
 func adOpportunityTrackerView(trackerView: TeadsAdOpportunityTrackerView) {
@@ -152,6 +155,7 @@ func adOpportunityTrackerView(trackerView: TeadsAdOpportunityTrackerView) {
 
 **Note: if you don't use your own ad slot you can add it directly to your teadsAdView.**
 
+
 ### Implement the TeadsAdDelegate
 
 The TeadsAdDelegate has 5 methods that you need to implement. It is responsible for following the lifecycle of an ad, the impression, when the user taps on it when an ad it shows and even when the user closes the ad.