diff --git a/tokio-util/src/codec/lines_codec.rs b/tokio-util/src/codec/lines_codec.rs
index 7a0a8f04541..5a6035d13b9 100644
--- a/tokio-util/src/codec/lines_codec.rs
+++ b/tokio-util/src/codec/lines_codec.rs
@@ -6,6 +6,8 @@ use std::{cmp, fmt, io, str, usize};
 
 /// A simple [`Decoder`] and [`Encoder`] implementation that splits up data into lines.
 ///
+/// This uses the `\n` character as the line ending on all platforms.
+///
 /// [`Decoder`]: crate::codec::Decoder
 /// [`Encoder`]: crate::codec::Encoder
 #[derive(Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]