diff --git a/docs/auth.md b/docs/auth.md
index 0a2af93..e7143de 100644
--- a/docs/auth.md
+++ b/docs/auth.md
@@ -39,14 +39,17 @@ More informations about 2FA is available on specific [portal documentation](http
 
 There is no current form that you can use to be added in a SIG group but you have to reach out to a SIG chair (having delegated rights to add/remove people in the SIG group you want to join) and he can then add you, after having confirmed that you can be onboarded in the SIG
 
-To know people who can "sponsors" you in a SIG/group, you can , once authenticated, search for a group on the portal and then see people listed under the "Sponsors" area (for example, consider the [Automotive SIG](https://accounts.centos.org/group/sig-automotive/)
+To know people who can "sponsors" you in a SIG/group, you can , once authenticated, search for a group on the portal and then see people listed under the "Sponsors" area (for example, consider the [Automotive SIG](https://accounts.centos.org/group/sig-automotive/) )
 
 
 ## Retrieving your TLS certificate
 
 To be able to request a signed TLS certificate, you need first to install the cli tool that will use kerberos auth first to request a locally generated (automatic) CSR to be sent to IPA for signing operation and you'll then get your certificate back.
 
-Supported Linux distributions: CentOS 8/8-s , Fedora 32,33,34
+Supported Linux distributions: CentOS Stream 8 (or el8 variant) , Fedora 33 and beyond
+
+!!! warning
+    There is currently no centos-packager pkg in epel9 so if you're using el9 (variant) you'll have to use a centos stream 8 or Fedora container
 
 ```
 sudo dnf install -y epel-release # only if you are on CentOS 8 / 8-stream not needed for Fedora
@@ -82,6 +85,47 @@ If you've signed up with the account name `tuser`, you can generate your new cer
 !!! warning
     Important note WRT OTP: If you have enabled Two Factor auth, you absolutely need to get a valid kerberos ticket through other step *before* using centos-cert. See details on the [Fedora Accounts Documentation](https://docs.fedoraproject.org/en-US/fedora-accounts/user/#twofactor) for this
 
+### TLS part for Staging env
+
+In case you'd need to interact with .stg. services (like [https://cbs.stg.centos.org](https://cbs.stg.centos.org)) that are relying on TLS auth, it's worth knowing that you'd need to get a different TLS cert.
+
+That means that you need an account from [https://accounts.stg.centos.org](https://accounts.stg.centos.org) , which isn't linked to production accounts.centos.org IPA backend.
+
+It's adviced to use a different container or home directory to retrieve your STG cert, and you can just point to [https://fasjson.stg.fedoraproject.org](https://fasjson.stg.fedoraproject.org) url (option `-f` for centos-cert)
+
+You can manually create (nothing -yet- in `centos-packager` for it) a ~/.koji/cbs-stg.conf that looks like this : 
+
+```
+[cbs-stg]
+
+;url of XMLRPC server
+server = https://cbs.stg.centos.org/kojihub/
+
+;url of web interface
+weburl = https://cbs.stg.centos.org/koji
+
+;url of package download site
+topurl = http://cbs.stg.centos.org/kojifiles
+
+;path to the koji top directory
+topdir = /mnt/koji
+
+;client certificate
+cert = ~/.centos-stg.cert
+
+;certificate of the CA that issued the HTTP server certificate
+serverca = /etc/pki/tls/certs/ca-bundle.trust.crt
+
+```
+
+!!! warning
+    You have to also ensure that your TLS file is renamed to correct filename !
+
+And you can then call koji like this : 
+
+```
+koji -c ~/.koji/cbs-stg.conf -p cbs-stg
+```
 
 ## Linking your CentOS account to gitlab
 
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index a383f5e..907e1fb 100755
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