Link both openmod forum tags

README.rst

@@ -118,7 +118,7 @@ oemof's documentation or rephrasing sections which are unclear.
 If you want to support us that way please fork the oemof-solph repository to your own
 github account and make changes as described in the `github guidelines <https://docs.github.com/en/get-started/quickstart/hello-world>`_
 
-If you have questions regarding the use of oemof including oemof-solph you can visit the forum at `openmod-initiative.org <https://forum.openmod-initiative.org/tags/c/qa/oemof>`_ and open a new thread if your questions hasn't been already answered.
+If you have questions regarding the use of oemof including oemof.solph you can visit the openmod forum (`tag oemof <https://forum.openmod-initiative.org/tags/c/qa/oemof>`_ or `tag oemof-solph <https://forum.openmod-initiative.org/tags/c/qa/oemof-solph>`_) and open a new thread if your questions hasn't been already answered.
 
 Keep in touch! - You can become a watcher at our `github site <https://github.com/oemof/oemof>`_,
 but this will bring you quite a few mails and might be more interesting for developers.