omicron_virgo.md

@@ -56,9 +56,16 @@ Triggers are saved in ROOT files following the `GWOLLUM` convention for triggers
 ```
 /data/omicron/V1
 ```
-For most cases, the trigger file location and/or format is irrelevant as Omicron triggers can be accessed automatically by [omicron programs](home#programs).
+For most cases, the trigger file location and/or format is irrelevant as Omicron triggers can be accessed automatically by [omicron programs](home#programs). This will only work if the environment variable `OMICRON_TRIGGERS` is correctly set:
+```
+$ echo $OMICRON_TRIGGERS 
+/data/omicron
+```
 
-Following a reorganization of the storage area at Cascina, the Omicron trigger file location is currently (O3) only accessible from online machines: `detchar1` or the `ctrl` machines but not the `farmn` machines.
+Following a reorganization of the storage area at Cascina, the Omicron trigger file location is currently (O3) only accessible from online machines: `detchar1` or the `ctrl` machines but not the `farmn` machines. Moreover, O3a triggers have been moved to `/data/prod/omicron/V1` (offline storage area). To access triggers automatically, the `OMICRON_TRIGGERS` must be redefined:
+```
+export OMICRON_TRIGGERS=/data/prod/omicron
+```
 
 If you get the error "No trigger files", look at the [faq](FAQ).