diff --git a/README.md b/README.md
index 6455af1..e6dc7a2 100644
--- a/README.md
+++ b/README.md
@@ -173,6 +173,10 @@ OPTIONS
        -i, --inplace
            Format files in place.
 
+       --lines=<start line>:<end line>
+           Limit formatting to the line range <start line> to <end line>. Multiple
+           ranges can be formatted by specifying multiple --lines arguments.
+
        -o <file>, --output=<file>
            File to write formatted output to. If no output is given, or if the file
            is `-`, output is written to stdout.
diff --git a/src/main.jl b/src/main.jl
index 7a4c717..da889fc 100644
--- a/src/main.jl
+++ b/src/main.jl
@@ -139,6 +139,10 @@ function print_help()
                -i, --inplace
                    Format files in place.
 
+               --lines=<start line>:<end line>
+                   Limit formatting to the line range <start line> to <end line>. Multiple
+                   ranges can be formatted by specifying multiple --lines arguments.
+
                -o <file>, --output=<file>
                    File to write formatted output to. If no output is given, or if the file
                    is `-`, output is written to stdout.