diff --git a/api/metrics.py b/api/metrics.py
index 8b66cd3..b51e5e1 100644
--- a/api/metrics.py
+++ b/api/metrics.py
@@ -22,8 +22,8 @@
     infra/proto/src/chromiumos/metrics.proto output type.
 
     Args:
-      output_events: A chromiumos.MetricEvent protobuf message.
-      prefix: A string to prepend to all metric event names.
+        output_events: A chromiumos.MetricEvent protobuf message.
+        prefix: A string to prepend to all metric event names.
     """
     counters = collections.defaultdict(int)
     counter_times = {}