diff --git a/src/bufio/scan.go b/src/bufio/scan.go
index a26b2ff17d..1a0a3907c9 100644
--- a/src/bufio/scan.go
+++ b/src/bufio/scan.go
@@ -260,8 +260,11 @@ func (s *Scanner) setErr(err error) {
 	}
 }
 
-// Buffer sets the initial buffer to use when scanning
+// Buffer controls memory allocation by the Scanner.
+// It sets the initial buffer to use when scanning
 // and the maximum size of buffer that may be allocated during scanning.
+// The contents of the buffer are ignored.
+//
 // The maximum token size must be less than the larger of max and cap(buf).
 // If max <= cap(buf), [Scanner.Scan] will use this buffer only and do no allocation.
 //