diff --git a/tracetools_trace/tools/lttng.py b/tracetools_trace/tools/lttng.py
index ca2373f..dd38953 100644
--- a/tracetools_trace/tools/lttng.py
+++ b/tracetools_trace/tools/lttng.py
@@ -13,10 +13,12 @@ from .names import (  # noqa: E402
 )
 
 
-def lttng_setup(session_name, full_path,
-                ros_events=DEFAULT_EVENTS_ROS,
-                kernel_events=DEFAULT_EVENTS_KERNEL,
-                context_names=DEFAULT_CONTEXT):
+def lttng_setup(
+        session_name,
+        full_path,
+        ros_events=DEFAULT_EVENTS_ROS,
+        kernel_events=DEFAULT_EVENTS_KERNEL,
+        context_names=DEFAULT_CONTEXT):
     """
     Set up LTTng session, with events and context.
 
diff --git a/tracetools_trace/trace.py b/tracetools_trace/trace.py
index 46f3e36..e28a62e 100644
--- a/tracetools_trace/trace.py
+++ b/tracetools_trace/trace.py
@@ -10,23 +10,28 @@ from tracetools_trace.tools import names
 
 def parse_args():
     parser = argparse.ArgumentParser(description='Setup and launch an LTTng tracing session.')
-    parser.add_argument('--session-name', '-s', dest='session_name',
-                        default=f'session-{time.strftime("%Y%m%d%H%M%S")}',
-                        help='the name of the tracing session (default: session-YYYYMMDDHHMMSS)')
-    parser.add_argument('--path', '-p', dest='path',
-                        default='/tmp',
-                        help='path of the base directory for trace data (default: %(default)s)')
-    parser.add_argument('--ust', '-u', nargs='*', dest='events_ust', default=names.DEFAULT_EVENTS_ROS,
-                        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=names.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)')
+    parser.add_argument(
+        '--session-name', '-s', dest='session_name',
+        default=f'session-{time.strftime("%Y%m%d%H%M%S")}',
+        help='the name of the tracing session (default: session-YYYYMMDDHHMMSS)')
+    parser.add_argument(
+        '--path', '-p', dest='path',
+        default='/tmp',
+        help='path of the base directory for trace data (default: %(default)s)')
+    parser.add_argument(
+        '--ust', '-u', nargs='*', dest='events_ust', default=names.DEFAULT_EVENTS_ROS,
+        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=names.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)')
     return parser.parse_args()