diff --git a/monkey/monkey_island/cc/models/monkey.py b/monkey/monkey_island/cc/models/monkey.py
index 35fcd3fcd..c0eeb20b3 100644
--- a/monkey/monkey_island/cc/models/monkey.py
+++ b/monkey/monkey_island/cc/models/monkey.py
@@ -38,6 +38,8 @@ class Monkey(Document):
     ttl_ref = ReferenceField(MonkeyTtl)
     tunnel = ReferenceField("self")
     command_control_channel = EmbeddedDocumentField(CommandControlChannel)
+    aws_instance_id = StringField(required=False)  # This field only exists when the monkey is running on an AWS
+    # instance. See https://github.com/guardicore/monkey/issues/426.
 
     # LOGIC
     @staticmethod