diff --git a/tracetools_trace/tools/lttng.py b/tracetools_trace/tools/lttng.py
index b790d5b..afac097 100644
--- a/tracetools_trace/tools/lttng.py
+++ b/tracetools_trace/tools/lttng.py
@@ -18,8 +18,6 @@ def lttng_setup(session_name, directory, ros_events=DEFAULT_EVENTS_ROS, kernel_e
     """
     ust_enabled = ros_events is not None and len(ros_events) > 0
     kernel_enabled = kernel_events is not None and len(kernel_events) > 0
-    print(f'UST tracing {f"enabled ({len(ros_events)} events)" if ust_enabled else "disabled"}')
-    print(f'kernel tracing {f"enabled ({len(kernel_events)} events)" if kernel_enabled else "disabled"}')
 
     # Domains
     if ust_enabled:
diff --git a/tracetools_trace/trace.py b/tracetools_trace/trace.py
index 7af99fc..484b09c 100644
--- a/tracetools_trace/trace.py
+++ b/tracetools_trace/trace.py
@@ -27,6 +27,8 @@ def main():
                         help='the ROS UST events to enable (default: all events) [to disable all UST events, provide this flag without any event name]')
     parser.add_argument('--kernel', '-k', nargs='*', dest='events_kernel', default=DEFAULT_EVENTS_KERNEL,
                         help='the kernel events to enable (default: all events) [to disable all UST events, provide this flag without any event name]')
+    parser.add_argument('--list', '-l', dest='list', action='store_true',
+                        help='display lists of enabled events (default: %(default)s)')
     args = parser.parse_args()
 
     session_name = args.session_name
@@ -35,6 +37,15 @@ def main():
     ros_events = args.events_ust
     kernel_events = args.events_kernel
 
+    ust_enabled = len(ros_events) > 0
+    kernel_enabled = len(kernel_events) > 0
+    print(f'UST tracing {f"enabled ({len(ros_events)} events)" if ust_enabled else "disabled"}')
+    if args.list and ust_enabled:
+        print(f'\tevents: {ros_events}')
+    print(f'kernel tracing {f"enabled ({len(kernel_events)} events)" if kernel_enabled else "disabled"}')
+    if args.list and kernel_enabled:
+        print(f'\tevents: {kernel_events}')
+
     lttng_setup(session_name, path, ros_events=ros_events, kernel_events=kernel_events)
     print(f'writting tracing session to: {path}')