id5 user id module: add a note on using multiple wrappers

modules/id5IdSystem.md

@@ -1,6 +1,6 @@
-# ID5 Universal ID
+# ID5 ID
 
-The ID5 ID is a shared, neutral identifier that publishers and ad tech platforms can use to recognise users even in environments where 3rd party cookies are not available. The ID5 ID is designed to respect users' privacy choices and publishers’ preferences throughout the advertising value chain. For more information about the ID5 ID and detailed integration docs, please visit [our documentation](https://support.id5.io/portal/en/kb/articles/prebid-js-user-id-module).
+The ID5 ID is a shared, neutral identifier that publishers and ad tech platforms can use to recognise users even in environments where 3rd party cookies are not available. The ID5 ID is designed to respect users' privacy choices and publishers’ preferences throughout the advertising value chain. For more information about the ID5 ID and detailed integration docs, please visit [our documentation](https://wiki.id5.io/en/identitycloud/retrieve-id5-ids/prebid-user-id-module/id5-prebid-user-id-module).
 
 ## ID5 ID Registration
 
@@ -29,7 +29,7 @@ pbjs.setConfig({
         abTesting: {             // optional
           enabled: true,         // false by default
           controlGroupPct: 0.1   // valid values are 0.0 - 1.0 (inclusive)
-        }, 
+        },
         disableExtensions: false // optional
       },
       storage: {
@@ -49,7 +49,7 @@ pbjs.setConfig({
 | name | Required | String | The name of this module: `"id5Id"`                                                                                                                                                                                                                                             | `"id5Id"` |
 | params | Required | Object | Details for the ID5 ID.                                                                                                                                                                                                                                                        | |
 | params.partner | Required | Number | This is the ID5 Partner Number obtained from registering with ID5.                                                                                                                                                                                                             | `173` |
-| params.pd | Optional | String | Partner-supplied data used for linking ID5 IDs across domains. See [our documentation](https://support.id5.io/portal/en/kb/articles/passing-partner-data-to-id5) for details on generating the string. Omit the parameter or leave as an empty string if no data to supply     | `"MT1iNTBjY..."` |
+| params.pd | Optional | String | Partner-supplied data used for linking ID5 IDs across domains. See [our documentation](https://wiki.id5.io/en/identitycloud/retrieve-id5-ids/passing-partner-data-to-id5) for details on generating the string. Omit the parameter or leave as an empty string if no data to supply     | `"MT1iNTBjY..."` |
 | params.provider | Optional | String | An identifier provided by ID5 to technology partners who manage Prebid setups on behalf of publishers. Reach out to [ID5](mailto:[email protected]) if you have questions about this parameter                                                                                     | `pubmatic-identity-hub` |
 | params.abTesting | Optional | Object | Allows publishers to easily run an A/B Test. If enabled and the user is in the Control Group, the ID5 ID will NOT be exposed to bid adapters for that request                                                                                                                  | Disabled by default |
 | params.abTesting.enabled | Optional | Boolean | Set this to `true` to turn on this feature                                                                                                                                                                                                                                     | `true` or `false` |
@@ -68,3 +68,6 @@ pbjs.setConfig({
 Publishers may want to test the value of the ID5 ID with their downstream partners. While there are various ways to do this, A/B testing is a standard approach. Instead of publishers manually enabling or disabling the ID5 User ID Module based on their control group settings (which leads to fewer calls to ID5, reducing our ability to recognize the user), we have baked this in to our module directly.
 
 To turn on A/B Testing, simply edit the configuration (see above table) to enable it and set what percentage of users you would like to set for the control group. The control group is the set of user where an ID5 ID will not be exposed in to bid adapters or in the various user id functions available on the `pbjs` global. An additional value of `ext.abTestingControlGroup` will be set to `true` or `false` that can be used to inform reporting systems that the user was in the control group or not. It's important to note that the control group is user based, and not request based. In other words, from one page view to another, a user will always be in or out of the control group.
+
+### A Note on Using Multiple Wrappers
+If you or your monetization partners are deploying multiple Prebid wrappers on your websites, you should make sure you add the ID5 ID User ID module to *every* wrapper. Only the bidders configured in the Prebid wrapper where the ID5 ID User ID module is installed and configured will be able to pick up the ID5 ID. Bidders from other Prebid instances will not be able to pick up the ID5 ID.