Documentation.md

@@ -58,7 +58,7 @@ New users can apply for a trial account with limited core/GPU hours without a pr
 
 For security reasons, you can't login with a combination of username and password. Instead, we use a system called **Multi-Factor-Authentication** (MFA, sometimes 2FA for two-factor), meaning you need to prove your identity with two different (as in different systems/locations) 'factors':
 
-- The first factor is given by the SSH public key. Please send your SSH _public_ key to the HPC team. [General information on public key authentication](https://www.ssh.com/academy/ssh/public-key-authentication)
+- The first factor is given by the SSH public key. Please send your SSH _public_ key to the HPC team. You can find general information on public key authentication [here](https://www.ssh.com/academy/ssh/public-key-authentication).
 - The second factor involves the Cisco Duo app. To use it, you will need to enroll your account, see [cisco-duo-setup.pdf](uploads/cd518a29f4362a9383c7345a975ed065/cisco-duo-setup.pdf) .
 
 If you own a [Yubikey](https://en.wikipedia.org/wiki/YubiKey) hardware token, you can also use it (in OTP mode) as the second authentication factor instead of Cisco Duo. If you are interested in using a Yubikey, please contact the [HPC-Team](mailto:hpc-mgr@uni-koeln.de). Please note: we can't provide Yubikeys to users, but it could be a worthwhile investment for about 50€.