diff --git a/docs/guides/using_black_with_other_tools.md b/docs/guides/using_black_with_other_tools.md
index 7bc0726dc27..9356caaf0bd 100644
--- a/docs/guides/using_black_with_other_tools.md
+++ b/docs/guides/using_black_with_other_tools.md
@@ -260,7 +260,7 @@ max-line-length = "88"
 #### Configuration
 
 ```
-max_line_length = 88
+max-line-length = 88
 ignore = E203
 ```