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Diffstat (limited to 'src/encoding/asn1/asn1.go')
-rw-r--r--src/encoding/asn1/asn1.go9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/encoding/asn1/asn1.go b/src/encoding/asn1/asn1.go
index 7c260b49d9..f9b9cb4930 100644
--- a/src/encoding/asn1/asn1.go
+++ b/src/encoding/asn1/asn1.go
@@ -1067,6 +1067,15 @@ func setDefaultValue(v reflect.Value, params fieldParameters) (ok bool) {
// set causes a SET, rather than a SEQUENCE type to be expected
// tag:x specifies the ASN.1 tag number; implies ASN.1 CONTEXT SPECIFIC
//
+// When decoding an ASN.1 value with an IMPLICIT tag into a string field,
+// Unmarshal will default to a PrintableString, which doesn't support
+// characters such as '@' and '&'. To force other encodings, use the following
+// tags:
+//
+// ia5 causes strings to be unmarshaled as ASN.1 IA5String values
+// numeric causes strings to be unmarshaled as ASN.1 NumericString values
+// utf8 causes strings to be unmarshaled as ASN.1 UTF8String values
+//
// If the type of the first field of a structure is RawContent then the raw
// ASN1 contents of the struct will be stored in it.
//