diff --git a/src/poetry/console/commands/add.py b/src/poetry/console/commands/add.py
index ee9a9df3784..451965cd431 100644
--- a/src/poetry/console/commands/add.py
+++ b/src/poetry/console/commands/add.py
@@ -30,7 +30,10 @@ class AddCommand(InstallerCommand, InitCommand):
         option(
             "dev",
             "D",
-            "Add as a development dependency. (<warning>Deprecated</warning>) Use --group=dev instead.",
+            (
+                "Add as a development dependency. (<warning>Deprecated</warning>) Use"
+                " --group=dev instead."
+            ),
         ),
         option("editable", "e", "Add vcs/path dependencies as editable."),
         option(