diff --git a/src/pkg/encoding/json/stream.go b/src/pkg/encoding/json/stream.go
index e8d6bd4c2c..1cb289fd84 100644
--- a/src/pkg/encoding/json/stream.go
+++ b/src/pkg/encoding/json/stream.go
@@ -148,7 +148,8 @@ func NewEncoder(w io.Writer) *Encoder {
 	return &Encoder{w: w}
 }
 
-// Encode writes the JSON encoding of v to the stream.
+// Encode writes the JSON encoding of v to the stream,
+// followed by a newline character.
 //
 // See the documentation for Marshal for details about the
 // conversion of Go values to JSON.