--- a/taskcluster/taskgraph/transforms/job/mozharness.py
+++ b/taskcluster/taskgraph/transforms/job/mozharness.py
@@ -5,16 +5,17 @@
 
 Support for running jobs via mozharness.  Ideally, most stuff gets run this
 way, and certainly anything using mozharness should use this approach.
 
 """
 
 from __future__ import absolute_import, print_function, unicode_literals
 import slugid
+import time
 
 from textwrap import dedent
 
 from taskgraph.util.schema import Schema
 from voluptuous import Required, Optional, Any
 
 from taskgraph.transforms.job import run_job_using
 from taskgraph.transforms.job.common import (
@@ -304,29 +305,39 @@ def mozharness_on_generic_worker(config,
 
 
 @run_job_using('buildbot-bridge', 'mozharness', schema=mozharness_run_schema)
 def mozharness_on_buildbot_bridge(config, job, taskdesc):
     run = job['run']
     worker = taskdesc['worker']
     branch = config.params['project']
     product = run.get('index', {}).get('product', 'firefox')
+    params = config.params
 
     worker.pop('env', None)
 
     if 'devedition' in job['attributes']['build_platform']:
         buildername = 'OS X 10.7 {} devedition build'.format(branch)
     else:
         buildername = 'OS X 10.7 {} build'.format(branch)
 
     worker.update({
         'buildername': buildername,
         'sourcestamp': {
             'branch': branch,
-            'repository': config.params['head_repository'],
-            'revision': config.params['head_rev'],
+            'repository': params['head_repository'],
+            'revision': params['head_rev'],
+            'changes': [{
+                'comments': params['message'],
+                'author': params['owner'],
+                'is_dir': 0,
+                'branch': params['project'],
+                'revision': params['head_rev'],
+                'revlink': '{}/rev/{}'.format(params['head_repository'], params['head_rev']),
+                'when_timestamp': int(time.time()),
+            }],
         },
         'properties': {
             'product': product,
             'who': config.params['owner'],
             'upload_to_task_id': slugid.nice(),
         }
     })

--- a/taskcluster/taskgraph/transforms/job/mozharness_test.py
+++ b/taskcluster/taskgraph/transforms/job/mozharness_test.py
@@ -1,13 +1,14 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 from __future__ import absolute_import, print_function, unicode_literals
+import time
 
 from voluptuous import Required
 from taskgraph.util.taskcluster import get_artifact_url
 from taskgraph.transforms.job import run_job_using
 from taskgraph.util.schema import Schema
 from taskgraph.transforms.tests import (
     test_description_schema,
     normpath
@@ -512,22 +513,32 @@ def mozharness_test_buildbot_bridge(conf
         else:
             buildername = '{prefix} {branch} {build_type} test {test_name}'.format(
                 prefix=prefix,
                 branch=branch,
                 build_type=build_type,
                 test_name=test_name
             )
 
+    params = config.params
     worker.update({
         'buildername': buildername,
         'sourcestamp': {
             'branch': branch,
             'repository': config.params['head_repository'],
             'revision': config.params['head_rev'],
+            'changes': [{
+                'comments': config.params['message'],
+                'author': params['owner'],
+                'is_dir': 0,
+                'branch': params['project'],
+                'revision': params['head_rev'],
+                'revlink': '{}/rev/{}'.format(params['head_repository'], params['head_rev']),
+                'when_timestamp': int(time.time()),
+            }],
         },
         'properties': {
             'product': test.get('product', 'firefox'),
             'who': config.params['owner'],
             'installer_path': mozharness['build-artifact-name'],
         }
     })
 

--- a/taskcluster/taskgraph/transforms/task.py
+++ b/taskcluster/taskgraph/transforms/task.py
@@ -417,16 +417,17 @@ task_description_schema = Schema({
         # see
         # https://github.com/mozilla/buildbot-bridge/blob/master/bbb/schemas/payload.yml
         Required('buildername'): basestring,
         Required('sourcestamp'): {
             'branch': basestring,
             Optional('revision'): basestring,
             Optional('repository'): basestring,
             Optional('project'): basestring,
+            Optional('changes'): list,
         },
         Required('properties'): {
             'product': basestring,
             Optional('build_number'): int,
             Optional('release_promotion'): bool,
             Optional('tuxedo_server_url'): optionally_keyed_by('project', basestring),
             Extra: taskref_or_string,  # additional properties are allowed
         },

--- a/taskcluster/taskgraph/try_option_syntax.py
+++ b/taskcluster/taskgraph/try_option_syntax.py
@@ -180,20 +180,23 @@ def escape_whitespace_in_brackets(input_
 
         result += char
 
     return result
 
 
 def split_try_msg(message):
     try:
+        message, _, mh_options = message.partition('mozharness:')
         try_idx = message.index('try:')
     except ValueError:
         return []
-    message = message[try_idx:].split('\n')[0]
+    # in-tree command line parser doesn't need mozharness: keyword,
+    # but it is necessary if we are running buildbot-bridge
+    message = message[try_idx:].split('\n')[0] + mh_options
     # shlex used to ensure we split correctly when giving values to argparse.
     return shlex.split(escape_whitespace_in_brackets(message))
 
 
 def parse_message(message):
     parts = split_try_msg(message)
 
     # Argument parser based on try flag flags