omicron_virgo.md

@@ -28,6 +28,11 @@ omicron version
 ```
 This should return the Omicron version number of your environment.
 
+For some omicron applications, you need to source a specific environment. Use:
+```
+source /cvmfs/oasis.opensciencegrid.org/ligo/sw/conda/envs/[conda flavor]/etc/omicron.env.sh
+```
+
 To know the conda environments available on your machine, type:
 ```
 conda info --envs