--- a/preface.roff	Tue May 15 19:19:17 2012 +0200
+++ b/preface.roff	Tue May 15 19:19:49 2012 +0200
@@ -47,8 +47,10 @@
 But my proposal had activated the nmh community.
 In the following weeks, goals for nmh's future were discussed.
 In these discussions, I became involved in the
-question whether nmh should be an MTA. (Thread subject:
-``should nmh be an MTA or an MUA?''.)
+question whether nmh should be an MTA.
+.[
+nmh-workers thread mta mua
+.]
 In this central point, my opinion differed from the opinion of most others.
 I argued for the MTA facility of nmh to be removed.
 Besides the discussions, hardly any real work was done.
@@ -147,13 +149,31 @@
 Further more, basic understanding of MIME is good to have.
 The Wikipedia provides good introduction-level information to email.
 Frequent references to the Unix philosophy will be made.
-Gancarz had tried to sum the philosophy up in his book ``The UNIX Philosophy''.
-Even better but less concrete are ``The UNIX Programming Environment'' and
-``The Practice of Programming'' by Kernighan and Pike.
-The term paper ``Why the Unix Philosophy still matters'' by myself
+Gancarz had tried to sum the philosophy up in his book
+``The UNIX Philosophy''.
+.[
+gancarz unix phil
+.]
+Even better but less concrete are ``The UNIX Programming Environment''
+.[
+kernighan pike unix prog env
+.]
+and ``The Practice of Programming''
+.[
+kernighan pike practice of prog
+.]
+by Kernighan and Pike.
+The term paper ``Why the Unix Philosophy still matters''
+.[
+why unix phil still matters schnalke
+.]
+by myself
 provides an overview on the topic, including a case study of MH.
 Although a brief introduction to MH is provided in Chapter 1, the reader
 is encouraged to have a look at the \fIMH Book\fP by Jerry Peek.
+.[
+peek mh
+.]
 It is the definitive guide to MH and nmh.
 The current version is available freely on the Internet.
 .P