diff --git a/docs/src/extensions.md b/docs/src/extensions.md
index f24518281..275690a33 100644
--- a/docs/src/extensions.md
+++ b/docs/src/extensions.md
@@ -29,3 +29,7 @@ We provide a simple implementation of `more`, which is not part of GNU
 coreutils. We do not aim for full compatibility with the `more` utility from
 `util-linux`. Features from more modern pagers (like `less` and `bat`) are
 therefore welcomed.
+
+## `cut`
+
+`cut` can separate fields by whitespace (Space and Tab) with `-w` flag. This feature is adopted from [FreeBSD](https://www.freebsd.org/cgi/man.cgi?cut).
\ No newline at end of file
diff --git a/src/uu/cut/src/cut.rs b/src/uu/cut/src/cut.rs
index efcebd8c6..5f0534795 100644
--- a/src/uu/cut/src/cut.rs
+++ b/src/uu/cut/src/cut.rs
@@ -90,6 +90,7 @@ static LONG_HELP: &str = "
         If the -w option is provided, fields will be separated by any number
         of  whitespace characters (Space and Tab). The output delimiter will
         be a Tab unless explicitly specified. Only one of -d or -w option can be specified.
+        This is an extension adopted from FreeBSD.
 
     Optionally Filter based on delimiter
         If the --only-delimited (-s) flag is provided, only lines which
@@ -675,7 +676,7 @@ pub fn uu_app() -> Command {
         .arg(
             Arg::new(options::WHITESPACE_DELIMITED)
                 .short('w')
-                .help("Use any number of whitespace (Space, Tab) to separate fields in the input source.")
+                .help("Use any number of whitespace (Space, Tab) to separate fields in the input source (FreeBSD extension).")
                 .value_name("WHITESPACE")
                 .action(ArgAction::SetTrue),
         )