Updates custom plugin documentation for clarity (#963)

This PR adds clarifying documentation to Setting up custom plugins, defining details that are necessary for successful installation. * Updates custom plugin documentation for clarity * apply review suggestion Co-authored-by: Michał Flendrich <[email protected]> Co-authored-by: Michał Flendrich <[email protected]>
Kong · Nov 30, 2020 · 812fd69 · 812fd69
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diff --git a/docs/guides/setting-up-custom-plugins.md b/docs/guides/setting-up-custom-plugins.md
@@ -198,5 +198,12 @@ Kong on when to execute the plugin:
 konghq.com/plugins: my-custom-plugin
 ```
 
+Please ensure that the `KongPlugin` custom resource is created in the same namespace 
+as the one in which the Ingress or Service to be annotated is going to be installed.
+
+Note that any environmental variables that your plugin requires should be added to 
+the `config` section `header_value`. If no environmental variables are used, this
+section can be omitted from the `KongPlugin` resource.
+
 Once you have got Kong up and running, configure your
 custom plugin via [KongPlugin resource](using-kongplugin-resource.md).