[PATCH] Document ID special property.

[Adam Spiers <orgmode@adamspiers.org>]

* doc/org.texi: add ID to the list of special properties.
---
 doc/org.texi |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/doc/org.texi b/doc/org.texi
index 4c48a03..ab8fb67 100644
--- a/doc/org.texi
+++ b/doc/org.texi
@@ -4926,6 +4926,7 @@ column view (@pxref{Column view}), or to use them in queries.  The following
 property names are special and (except for @code{:CATEGORY:}) should not be
 used as keys in the properties drawer:
 
+@cindex property, special, ID
 @cindex property, special, TODO
 @cindex property, special, TAGS
 @cindex property, special, ALLTAGS
@@ -4942,6 +4943,8 @@ used as keys in the properties drawer:
 @cindex property, special, ITEM
 @cindex property, special, FILE
 @example
+ID           @r{A globally unique ID used for synchronization during}
+             @r{iCalendar or MobileOrg export.}
 TODO         @r{The TODO keyword of the entry.}
 TAGS         @r{The tags defined directly in the headline.}
 ALLTAGS      @r{All tags, including inherited ones.}
-- 
1.7.8.206.g71406