diff --git a/Makefile b/Makefile
index 264007a..aff6cb4 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ all: develop lint test
 .PHONY: all
 
 develop: pre-commit
-	@poetry install
+	@poetry install --with tests,dev
 	@poetry shell
 .PHONY: develop
 
diff --git a/tests/trestlebot/test_bot.py b/tests/trestlebot/test_bot.py
index 7a2c678..29250b3 100644
--- a/tests/trestlebot/test_bot.py
+++ b/tests/trestlebot/test_bot.py
@@ -347,7 +347,7 @@ def test_run_with_provider(tmp_repo: Tuple[str, Repo]) -> None:
             head_branch="test",
             base_branch="main",
             title="Automatic updates from bot",
-            body="",
+            body="Authored by trestle-bot.",
         )
         mock_push.assert_called_once_with(refspec="HEAD:test")
 
@@ -396,6 +396,6 @@ def test_run_with_provider_with_custom_pr_title(tmp_repo: Tuple[str, Repo]) -> N
             head_branch="test",
             base_branch="main",
             title="Test",
-            body="",
+            body="Authored by trestle-bot.",
         )
         mock_push.assert_called_once_with(refspec="HEAD:test")
diff --git a/trestlebot/bot.py b/trestlebot/bot.py
index 23aeadd..955ded3 100644
--- a/trestlebot/bot.py
+++ b/trestlebot/bot.py
@@ -120,7 +120,7 @@ def _create_pull_request(
             head_branch=self.branch,
             base_branch=self.target_branch,
             title=pull_request_title,
-            body="",
+            body="Authored by trestle-bot.",
         )
         return pr_number