diff --git a/netarch/trilobytes.py b/netarch/trilobytes.py
index dd93d8d..b371f47 100644
--- a/netarch/trilobytes.py
+++ b/netarch/trilobytes.py
@@ -39,6 +39,12 @@ class TriloBytes:
     >>> bytes(tb)
     b'hiOPDROPD'
 
+    >>> tb = TriloBytes(b'00')^1
+    >>> tb[0]
+    1
+    >>> bytes(TriloBytes(b'00'))
+    b'\x00'
+
 """
 
     def __init__(self, initializer=(), drop=b'?'):