diff --git a/src/darker/help.py b/src/darker/help.py
index 3b3f886be..24c5290f2 100644
--- a/src/darker/help.py
+++ b/src/darker/help.py
@@ -133,9 +133,7 @@ def get_extra_instruction(dependency: str) -> str:
     " `skip-magic-trailing-comma = true` from a Black configuration file."
 )
 
-PREVIEW = (
-    "Use Black's experimental preview style"
-)
+PREVIEW = "Use Black's experimental preview style"
 
 LINE_LENGTH = "How many characters per line to allow [default: 88]"