update submissions guide

Author: emitanaka

submissions.Rmd

@@ -66,6 +66,11 @@ The `rjtools` package has a number of functions which can help you check that yo
     - `check_packages_available()` additionally referenced packaged are also available on CRA or Bioconductor
 - Each of these can also be run individually.
 
+
+## Long-term accessibility
+
+Authors are encouraged to think about the long-term accessibility of any key components of their submission that are hosted online, such as interactive applications or documentation websites. Rather than linking directly to a specific hosting service that may change, move, or shut down over time, consider pointing readers to a stable landing page under your control or to a resource with a permanent identifier. For example, if you are hosting a Shiny application, you could link to a landing page under your control that has the link to the live app, rather than linking directly to the hosting service. This way, if the hosting service changes or the app needs to be moved, you can update the landing page without breaking the link in your article. 
+
 # Submitting your article
 
 To submit an article to the R Journal, you will need to complete [this form](https://forms.gle/Eqkf6cFJM3mjuxZUA).