diff --git a/lispref/customize.texi b/lispref/customize.texi
index 0da420cafc9..71dc5b90740 100644
--- a/lispref/customize.texi
+++ b/lispref/customize.texi
@@ -734,6 +734,23 @@ The value must be a list and each element of the list must fit the type
 @var{element-type}.  This appears in the customization buffer as a
 list of elements, with @samp{[INS]} and @samp{[DEL]} buttons for adding
 more elements or removing elements.
+
+@item (checklist @var{type} @dots{})
+The @var{type} arguments represent each checklist item.  The value will
+be a list containing the values of all checked @var{type} arguments.
+The checklist will match a list whose elements all match at least one of
+the specified @var{type} arguments.
+
+Usually a checklist will only match if the items are in the exact
+sequence given in the specification.  If you supply the additional
+arguments @code{:greedy t}, it will allow the items to come in any
+sequence.  However, if you extract the value they will be in the
+sequence given in the checklist, i.e.@: the original sequence is
+forgotten.
+
+Using this type with @code{:greedy} is useful for specifying association
+or property lists with keys from a fixed set and properly-typed
+arguments.
 @end table
 
 @node Splicing into Lists