Small clarification on why tag main

docs/developer_guide/release.rst

@@ -15,5 +15,6 @@ The version number is expected to be in SemVer format and will be referred to as
 - Create Git tag from ``master``: ``git tag M.m.p --sign``
 - Push the tag to the repository: ``git push M.m.p``
 - This should produce a conda package on https://anaconda.org/mantid/mantidimaging that is using the version from the new tag.
-  - Edit the labels on this package and add :code:`main`
+  - Edit the labels on this package and add :code:`main`. This will make IDAaaS automatically pick it up when it creates the release environment.
+  - We may leave the :code:`unstable` tag, as they don't conflict with each other. It just means that there may be a point where the release and unstable environment point to the same version. This will change as soon as a new unstable version is published.
 - (optional) Add release notes in the docs GitHub