diff --git a/README.md b/README.md
index 3cdd6cbd61..55ca9b50e8 100644
--- a/README.md
+++ b/README.md
@@ -237,6 +237,8 @@ Options:
           Regular expression matching the name of dummy variables
       --target-version <TARGET_VERSION>
           The minimum Python version that should be supported
+      --line-length <LINE_LENGTH>
+          Set the line-length for length-associated checks and automatic formatting
       --stdin-filename <STDIN_FILENAME>
           The name of the file when passing it through stdin
   -h, --help
diff --git a/src/cli.rs b/src/cli.rs
index dd4564d8c8..81a45283da 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -87,6 +87,10 @@ pub struct Cli {
     /// The minimum Python version that should be supported.
     #[arg(long)]
     pub target_version: Option<PythonVersion>,
+    /// Set the line-length for length-associated checks and automatic
+    /// formatting.
+    #[arg(long)]
+    pub line_length: Option<usize>,
     /// Round-trip auto-formatting.
     // TODO(charlie): This should be a sub-command.
     #[arg(long, hide = true)]
diff --git a/src/main.rs b/src/main.rs
index 160edb3653..30029b4df8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -292,6 +292,9 @@ fn inner_main() -> Result<ExitCode> {
     if !cli.extend_ignore.is_empty() {
         configuration.extend_ignore = cli.extend_ignore;
     }
+    if let Some(line_length) = cli.line_length {
+        configuration.line_length = line_length;
+    }
     if let Some(target_version) = cli.target_version {
         configuration.target_version = target_version;
     }