{endcode}
 _Note:_ Pick different numbers for the COLLECTOR_HOST and the NEGOTIATOR_HOST. These are port numbers, and each personal HTCondor running on a machine needs to have different ports. Probably randomly picking numbers that are greater than 1024 will be sufficient.
 
+_Note:_ It may be useful to set =CONDOR_HOST = localhost= or =CONDOR_HOST = localhost.localdomain= if the machine running this does not have a valid IP address, is a virtual machine, or the administrator wants HTCondor to look only at that machine.
+
 This looks like a lot of things to edit. Why is it so hard? Well, our installation script normally sets things up for you, but because you are using a build environment, it is harder to use the installation script. Also, it is useful for you to be familiar with these settings, so you understand better how HTCondor works.
 
 {subsubsection: Run HTCondor}