Add author comments for 1984/mullender

By a happy chance I found an article that has some words about the entry
from Mullender. See the README.md for the link to that article. We thank
the author of the article for this information!

1984/mullender/README.md

@@ -44,8 +44,50 @@ couldn't!  :-)
 
 ## Author's comments:
 
-No comments were provided by the author.
+These comments, found at
+[https://lainsystems.com/posts/exploring-mullender-dot-c/](https://lainsystems.com/posts/exploring-mullender-dot-c/),
+were provided by Sjoerd Mullender years later. We thank the author of the
+article for the quote!
 
+I have never known a lot about the VAX assembly, so we used the C compiler to
+create the VAX code. We didn't write it ourselves from scratch as we did with
+the PDP code. This is the reason why the VAX code is more complex, including the
+extra data after the PDP code.
+
+Robbert and I were students at the VU (Free University in Amsterdam) at the time
+(mathematics with CS as our major since there was no CS curriculum when we
+started). We had an assignment to create a pair of programs for the computer
+networks course. The programs were supposed to send data reliably from one
+program to the other over an unreliable channel. This channel was simulated with
+a pair of pipes.
+
+We decided for fun to create an obfuscated set of programs, only for the PDP, to
+do this, but circumventing the channel. (I.e. cheating, hence the needed
+obfuscation.) Our programs worked and we handed them in.
+
+Of course, the teacher had a good laugh and then rejected our submission. (We
+knew him well, so we could get away with this.)
+
+Then the IOCCC came along. I don’t remember how we heard about it, but at the
+time there was a world-wide messaging network Usenet where we read a bunch of
+newsgroups. I’m sure it was announced there and we saw it.
+
+Since we had just recently created these obfuscated programs we decided we could
+use the same technique for an obfuscated C program. We upped the ante a bit by
+making it “portable”.
+
+To add to the obfuscation, we used different formats for the integers in the
+array, some in decimal, some in octal, some in hexadecimal, and when the value
+would fit, some as an ASCII character.
+
+The rest is history.
+
+Since this was the first contest, we hadn't seen any old entries, nor had any of
+the other contestants. Of course we knew about #define and tricks you could do
+with that, but we didn't need that for this program. In fact, we made it as
+“standard” as possible. At the time there was this program called “cb” for C
+beautifier which would re-indent your program to make the layout look better. Our
+program is idempotent under cb.
 
 Copyright (c) 1984, Landon Curt Noll.
 All Rights Reserved.  Permission for personal, educational or non-profit use is