diff --git a/tern/__main__.py b/tern/__main__.py
index e352f521..bb45bd04 100755
--- a/tern/__main__.py
+++ b/tern/__main__.py
@@ -208,6 +208,17 @@ def main():
                                help="Generate a report for the current state "
                                "of the filesystem. This is useful when "
                                "running Tern in a new namespace or VM.")
+    parser_report.add_argument('-ctx', '--with-context', metavar='FILES',
+                               nargs='+',
+                               help="""Generate a report taking into account
+                               reports generated by previous runs against
+                               the same filesystem. This option is meant to
+                               be used with the --live option like this:
+                               tern report --live <path/to/filesystem> -ctx
+                               report1 report2 report3... -f json -o report4.
+                               The order of the reports must correspond to the
+                               order in which they were generated. Supported
+                               input report formats are: json""")
 
     # subparser for dockerfile lock
     parser_lock = subparsers.add_parser('lock',