--- a/ch01.roff	Wed Jun 20 11:48:52 2012 +0200
+++ b/ch01.roff	Wed Jun 20 17:57:37 2012 +0200
@@ -112,6 +112,39 @@
 As the MH tool chest was modeled after the Unix tool chest, the
 properties of the latter apply to the former as well.
 
+
+.ig \"XXX
+
+.P
+To ease typing, the switches can be abbreviated as much as the remaining
+prefix remains unambiguous.
+If in our example no other switch would start with the letter `t', then
+.Cl "-truncate" ,
+.Cl "-trunc" ,
+.Cl "-tr" ,
+and
+.Cl "-t
+would all be the same.
+As a result, switches can neither be grouped (as in
+.Cl "ls -ltr" )
+nor can switch arguments be appended directly to the switch (as in
+.Cl "sendmail -q30m" ).
+.P
+Many switches have negating counter-parts, which start with `no'.
+For example
+.Cl "-notruncate
+inverts the
+.Cl "-truncate
+switch.
+They exist to undo the effect of default switches in the profile.
+If the user has chosen to change the default behavior of some tool
+by adding a default switch to the profile,
+he can still undo this change in behavior by specifying the inverse
+switch on the command line.
+
+..
+
+
 .U2 "Using MH
 .P
 It is strongly recommended to have a look at the MH Book,