update a comment
diff --git a/src/cryptography/hazmat/primitives/keywrap.py b/src/cryptography/hazmat/primitives/keywrap.py
index 89925f3..6e79ab6 100644
--- a/src/cryptography/hazmat/primitives/keywrap.py
+++ b/src/cryptography/hazmat/primitives/keywrap.py
@@ -29,8 +29,9 @@
n = len(r)
for j in range(6):
for i in range(n):
- # every encryption operation is a discrete 16 byte chunk so
- # it is safe to reuse the encryptor for the entire operation
+ # every encryption operation is a discrete 16 byte chunk (because
+ # AES has a 128-bit block size) and since we're using ECB it is
+ # safe to reuse the encryptor for the entire operation
b = encryptor.update(a + r[i])
# pack/unpack are safe as these are always 64-bit chunks
a = struct.pack(