diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index 6005270a75fec..e53e1f4930935 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -2110,7 +2110,7 @@ pub trait BufRead: Read {
     }
 
     /// Read all bytes until a newline (the `0xA` byte) is reached, and append
-    /// them to the provided buffer.
+    /// them to the provided buffer (without clear buffer before appending to it).
     ///
     /// This function will read bytes from the underlying stream until the
     /// newline delimiter (the `0xA` byte) or EOF is found. Once found, all bytes