Fix tags docs

README.md

@@ -37,6 +37,7 @@ Storybook test runner turns all of your stories into executable tests.
   - [getHttpHeaders](#gethttpheaders)
   - [tags (experimental)](#tags-experimental)
   - [logLevel](#loglevel)
+  - [errorMessageFormatter](#errormessageformatter)
   - [Utility functions](#utility-functions)
     - [getStoryContext](#getstorycontext)
     - [waitForPageReady](#waitforpageready)
@@ -235,13 +236,15 @@ export default meta;
 export const Primary = {};
 
 export const Secondary = {
-  // will override tags to be just ['skip']
+  // will combine with meta tags to be ['design', 'test-only', 'skip']
   tags: ['skip'],
 };
 ```
 
 > **Note**
-> You can't import constants from another file and use them to define tags in your stories. The tags in your stories or meta **have to be** defined inline, as an array of strings. This is a limitation due to Storybook's static analysis.
+> You can't import constants from another file and use them to define tags in your stories. The tags in your stories or meta **must be** defined inline, as an array of strings. This is a restriction due to Storybook's static analysis.
+
+For more information on how tags combine (and can be selectively removed), please see the [official docs](https://storybook.js.org/docs/writing-stories/tags).
 
 Once your stories have your own custom tags, you can filter them via the [tags property](#tags-experimental) in your test-runner configuration file. You can also use the CLI flags `--includeTags`, `--excludeTags` or `--skipTags` for the same purpose. The CLI flags will take precedence over the tags in the test-runner config, therefore overriding them.