diff --git a/std/io/scan.jule b/std/io/scan.jule
index 32c89c876..115e33179 100644
--- a/std/io/scan.jule
+++ b/std/io/scan.jule
@@ -40,6 +40,7 @@ impl Scanner {
 
     // Returns bytes of recent scan.
     // Returned slice is mutable copy of buffer.
+    // The next [Scan] call will write into same internal allocation.
     fn Bytes(self): []byte { ret self.b }
 
     // Returns text from bytes of recent scan.