alpm-hooks: add Description field

The "Description" field allows a hook to provide a some text for frontends
to use in describing what the hook is doing.  For example:

Description = updating info page directory

Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/doc/alpm-hooks.5.txt b/doc/alpm-hooks.5.txt
index 3729387c..f33ff8cd 100644
--- a/doc/alpm-hooks.5.txt
+++ b/doc/alpm-hooks.5.txt
@@ -19,6 +19,7 @@ Type = File|Package (Required)
 Target = <Path|PkgName> (Required, Repeatable)
 
 [Action] (Required)
+Description = ... (Optional)
 When = PreTransaction|PostTransaction (Required)
 Exec = <Command> (Required)
 Depends = <PkgName> (Optional)
@@ -63,6 +64,10 @@ defined the hook will run if the transaction matches *any* of the triggers.
 ACTIONS
 -------
 
+* Description =* ...::
+	An optional description that describes the action being taken by the
+	hook for use in front-end output.
+
 *Exec =* <command>::
 	Command to run.  Command arguments are split on whitespace.  Values
 	containing whitespace should be enclosed in quotes.  Required.