-encoding to DER (Distinguished Encoding Rules). Although ASN.1 is
-written more than 30 years ago by wise Ancients (taken from ``pyasn1``'s
-README), it is still often can be seen anywhere in our life.
+encoding to either DER (Distinguished Encoding Rules) or CER (Canonical
+Encoding Rules). Although ASN.1 is written more than 30 years ago by wise
+Ancients (taken from ``pyasn1``'s README), it is still often can be seen
+anywhere in our life.