diff --git a/nslsii/sync_experiment/.DS_Store b/nslsii/sync_experiment/.DS_Store
deleted file mode 100644
index 5008ddfc..00000000
Binary files a/nslsii/sync_experiment/.DS_Store and /dev/null differ
diff --git a/nslsii/sync_experiment/sync_experiment.py b/nslsii/sync_experiment/sync_experiment.py
index f0bdfa12..2e4e8522 100644
--- a/nslsii/sync_experiment/sync_experiment.py
+++ b/nslsii/sync_experiment/sync_experiment.py
@@ -3,6 +3,7 @@
 
 import json
 import re
+import os
 import redis
 import httpx
 import warnings
@@ -174,8 +175,7 @@ def main():
         "--beamline",
         dest="beamline",
         type=str,
-        help="Which beamline (e.g. CHX)",
-        required=True,
+        help="Which beamline (e.g. CHX)"
     )
     parser.add_argument(
         "-p",
@@ -188,6 +188,11 @@ def main():
     parser.add_argument("-v", "--verbose", action=argparse.BooleanOptionalAction)
 
     args = parser.parse_args()
+    
+    beamline = args.beamline or os.getenv("BEAMLINE_ACRONYM")
+    # Make required:
+    if not beamline:
+        raise ValueError("Beamline needs to be specified. Either provide -b, --beamline or set BEAMLINE_ACRONYM in env vars.")
     sync_experiment(
-        proposal_number=args.proposal, beamline=args.beamline, verbose=args.verbose
+        proposal_number=args.proposal, beamline=beamline, verbose=args.verbose
     )