Code format

README.md

@@ -7,7 +7,7 @@
 [![GitHub license](https://img.shields.io/pypi/l/pyasn1-fasder)](https://raw.githubusercontent.com/cbonnell/pyasn1-fasder/main/LICENSE)
 
 pyasn1-fasder is a DER decoder for pyasn1 with a focus on checking the correctness of encoding. This decoder is more pedantic than most other decoders in terms of flagging DER
-encoding errors, and this behavior is  unlikely to change.
+encoding errors, and this behavior is unlikely to change.
 
 ## Installation
 
@@ -17,6 +17,18 @@ encoding errors, and this behavior is  unlikely to change.
 
 pyasn1-fasder exposes a single function: `decode_der`. The signature and return type are the same as the pyasn1 `decode` function, as it is intended to be a drop-in replacement of `pyasn1.codec.der.decoder.decode`.
 
+```python
+from pyasn1.type.char import PrintableString
+from pyasn1_fasder import decode_der
+
+substrate = b'\x13\x03\x41\x42\x43'
+
+decoded, rest = decode_der(substrate, asn1Spec=PrintableString())
+
+assert rest == b''
+assert str(decoded) == 'ABC'
+```
+
 ## Limitations
 
 * There is no encoding counterpart.