Update readme

readme.md

@@ -4,9 +4,9 @@ This action allows you to specify an existing database in your Notion account th
 
 Typically used alongside https://github.com/mikepenz/release-changelog-builder-action
 
-## Notion token
+## Notion integration and token
 
-You need to have set `env.NOTION_TOKEN` - which you can get from https://www.notion.so/my-integrations after creating an integration.
+You need to have an integration access token - which you can get from https://www.notion.so/my-integrations after creating an integration.
 
 ## Notion Database
 
@@ -16,6 +16,8 @@ Name: text
 Date: date
 Tags: tags
 
+Note that you *must* share your database with the integration you created earlier to be able to access it!
+
 It can look like this:
 
 <img width="981" alt="Screenshot 2021-12-18 at 08 55 42" src="https://user-images.githubusercontent.com/239305/146633970-5e1baaf8-6457-4664-b56c-284355e3b241.png">