diff --git a/zerver/webhooks/trello/tests.py b/zerver/webhooks/trello/tests.py
index d2d5a21a40..f43b4d4de9 100644
--- a/zerver/webhooks/trello/tests.py
+++ b/zerver/webhooks/trello/tests.py
@@ -89,7 +89,7 @@ class TrelloHookTests(WebhookTestCase):
         self.send_and_test_stream_message('adding_new_list_to_board', u"Welcome Board", expected_message)
 
     def test_trello_webhook_when_comment_was_added_to_card(self) -> None:
-        expected_message = u"TomaszKolek commented on [New card](https://trello.com/c/xPKXoSTQ)\n~~~ quote\nNew comment\n~~~"
+        expected_message = u"TomaszKolek commented on [New card](https://trello.com/c/xPKXoSTQ):\n~~~ quote\nNew comment\n~~~"
         self.send_and_test_stream_message('adding_comment_to_card', u"Welcome Board", expected_message)
 
     def test_trello_webhook_when_board_was_renamed(self) -> None:
@@ -121,7 +121,7 @@ class TrelloHookTests(WebhookTestCase):
         self.assert_json_success(result)
 
     def test_trello_webhook_when_description_was_added_to_card(self) -> None:
-        expected_message = u"Marco Matarazzo set description for [New Card](https://trello.com/c/P2r0z66z) to\n~~~ quote\nNew Description\n~~~"
+        expected_message = u"Marco Matarazzo set description for [New Card](https://trello.com/c/P2r0z66z) to:\n~~~ quote\nNew Description\n~~~"
         self.send_and_test_stream_message('adding_description_to_card', u"Welcome Board", expected_message)
 
     def test_trello_webhook_when_description_was_removed_from_card(self) -> None:
diff --git a/zerver/webhooks/trello/view/card_actions.py b/zerver/webhooks/trello/view/card_actions.py
index d58a842d78..a3a4a46e5f 100644
--- a/zerver/webhooks/trello/view/card_actions.py
+++ b/zerver/webhooks/trello/view/card_actions.py
@@ -45,7 +45,7 @@ ACTIONS_TO_MESSAGE_MAPPER = {
     CREATE: u'created {card_url_template}.',
     CHANGE_LIST: u'moved {card_url_template} from {old_list} to {new_list}.',
     CHANGE_NAME: u'renamed the card from "{old_name}" to {card_url_template}.',
-    SET_DESC: u'set description for {card_url_template} to\n~~~ quote\n{desc}\n~~~\n',
+    SET_DESC: u'set description for {card_url_template} to:\n~~~ quote\n{desc}\n~~~\n',
     CHANGE_DESC: (u'changed description for {card_url_template} from\n' +
                   '~~~ quote\n{old_desc}\n~~~\nto\n~~~ quote\n{desc}\n~~~\n'),
     REMOVE_DESC: u'removed description from {card_url_template}.',
@@ -60,7 +60,7 @@ ACTIONS_TO_MESSAGE_MAPPER = {
     REMOVE_MEMBER: u'removed {member_name} from {card_url_template}.',
     ADD_ATTACHMENT: u'added [{attachment_name}]({attachment_url}) to {card_url_template}.',
     ADD_CHECKLIST: u'added the {checklist_name} checklist to {card_url_template}.',
-    COMMENT: u'commented on {card_url_template}\n~~~ quote\n{text}\n~~~\n',
+    COMMENT: u'commented on {card_url_template}:\n~~~ quote\n{text}\n~~~\n',
     UPDATE_CHECK_ITEM_STATE: u'{action} **{item_name}** in **{checklist_name}** ({card_url_template}).'
 }