X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/blobdiff_plain/460bbf886ec7118475714d395033bd90d23d328f..6a61f346525a8eeaadf79f77435e5755a0b136ce:/symm/modes-test.h

diff --git a/symm/modes-test.h b/symm/modes-test.h
index a53341ce..83d35dc3 100644
--- a/symm/modes-test.h
+++ b/symm/modes-test.h
@@ -105,7 +105,8 @@ typedef void encfn(const octet */*s*/, octet */*d*/, size_t /*sz*/);
  *
  *		  * @enc@ is called to encrypt a source buffer @s@ and write
  *		    the ciphertext to a destination @d@; @sz@ is the common
- *		    size of these buffers.
+ *		    size of these buffers.  @d@ might be null, to discard
+ *		    output; @s@ might be null, to process all-zero input.
  *
  *		  * @dec@ is called to decrypt a source buffer @s@ and write
  *		    the recovered plaintext to a destination @d@; @sz@ is the