diff --git a/src/encoding/csv/reader.go b/src/encoding/csv/reader.go
index a6bb780bf28a0b76de6fd02e323665d1db8cd5fc..816ed26754277673433b9c4afc7e541acf2c0b3e 100644
--- a/src/encoding/csv/reader.go
+++ b/src/encoding/csv/reader.go
@@ -99,6 +99,8 @@ var (
 // non-doubled quote may appear in a quoted field.
 //
 // If TrimLeadingSpace is true, leading white space in a field is ignored.
+// If the field delimiter is white space, TrimLeadingSpace will trim the
+// delimiter.
 type Reader struct {
 	Comma            rune // field delimiter (set to ',' by NewReader)
 	Comment          rune // comment character for start of line