Document 'custom-group'

* doc/lispref/customize.texi (Group Definitions): Document the
'custom-group' property.

diff --git a/doc/lispref/customize.texi b/doc/lispref/customize.texi
index 7fea507fd0320a89281ec1e3afb6e553f3b2ea6d..4d88d7c8c98db3727e1ef9191f9de2f9de36c80a 100644 (file)
--- a/doc/lispref/customize.texi
+++ b/doc/lispref/customize.texi
@@ -257,6 +257,13 @@ customizable variable @code{custom-unlispify-remove-prefixes} is
 non-@code{nil}, the item's tag will omit @var{prefix}.  A group can
 have any number of prefixes.
 @end table
+
+@cindex @code{custom-group} property
+The variables and subgroups of a group are stored in the
+@code{custom-group} property of the group's symbol.  @xref{Symbol
+Plists}.  The value of that property is a list of pairs whose
+@code{car} is the variable or subgroup symbol and the @code{cdr} is
+either @code{custom-variable} or @code{custom-group}.
 @end defmac
 
 @defopt custom-unlispify-remove-prefixes