diff --git a/endpoints/api/logs.py b/endpoints/api/logs.py
index f95be5d12..8d0068714 100644
--- a/endpoints/api/logs.py
+++ b/endpoints/api/logs.py
@@ -78,8 +78,8 @@ class RepositoryLogs(RepositoryParamResource):
   @require_repo_admin
   @nickname('listRepoLogs')
   @parse_args()
-  @query_param('starttime', 'Earliest time from which to get logs (%m/%d/%Y %Z)', type=str)
-  @query_param('endtime', 'Latest time to which to get logs (%m/%d/%Y %Z)', type=str)
+  @query_param('starttime', 'Earliest time from which to get logs. The time should be formatted "%m/%d/%Y" in UTC.', type=str)
+  @query_param('endtime', 'Latest time to which to get logs. The time should be formatted "%m/%d/%Y" in UTC.', type=str)
   @page_support()
   def get(self, namespace, repository, page_token, parsed_args):
     """ List the logs for the specified repository. """