Updated documentation.

doc/snac.1

@@ -77,15 +77,23 @@ around the world.
 .It Bio
 Enter here a bunch of self-indulgent blurb about yourself.
 The same markup options available for text notes apply here.
-.It Email address for notifications
-If this field is not empty, an email message will be sent
-to this address whenever a post written by you is liked,
-boosted or replied to.
 .It Always show sensitive content
 By default,
 .Nm
 hides content marked as sensitive by their publishers.
 If you check this option, sensitive content is always shown.
+.It Email address for notifications
+If this field is not empty, an email message will be sent
+to this address whenever a post written by you is liked,
+boosted or replied to.
+.It Maximum days to keep posts
+This numeric value specifies the number of days to pass before
+posts (yours and others') will be purged. This value overrides
+what the administrator defined in the global server settings
+only if it's lesser (i.e. you cannot keep posts for longer
+than what the admin desires). A value of 0 (the default) means
+that the global server settings will apply to the posts in your
+timeline.
 .It Password
 Write the same string in these two fields to change your
 password. Don't write anything if you don't want to do this.