diff --git a/MAC/Services/src/ObservationControl2.py b/MAC/Services/src/ObservationControl2.py
index 204d700fd0e7e36a7b0e0fdb80a41c416c615079..e1a2d4c2581c681ad74177f38f2bf403bc44f2c6 100644
--- a/MAC/Services/src/ObservationControl2.py
+++ b/MAC/Services/src/ObservationControl2.py
@@ -24,6 +24,7 @@ from optparse import OptionParser
 from fabric.exceptions import NetworkError
 
 try:
+    # WARNING: This code only works with Fabric Version 1
     from fabric import tasks
     from fabric.api import env, run, settings
 except ImportError as e: