Fetch a specific branch using git

I want to download source code from the master-next branch using git as described in the Xilinx wiki . I tried this: #git clone git://github.com/Xilinx/u-boot-xlnx/tree/master-next.git Initialized empty Git repository in /home/Hannan/master-next/.git/ fatal: remote error: Xilinx/u-boot-xlnx/tree/master-next is not a valid repository name Email support@github.com for help Even this failed: # git clone git://github.com/Xilinx/tree/master-next/u-boot-xlnx.git Initialized empty Git repository in /home/Hannan/u-boot-xlnx/.git/ fatal: remote error: Xilinx/tree/master-next/u-boot-xlnx is not a valid repository name Email support@github.com for help The command that works is: git clone git://github.com/Xilinx/u-boot-xlnx.git But how do I know that this will indeed fetch the master-next branch and not the master branch ? How do I correctly fetch a specific branch using git? I am using RHEL 6, accessed via PuTTY.