diff --git a/src/calibre/library/caches.py b/src/calibre/library/caches.py
index ac13474c69..be4b24cf89 100644
--- a/src/calibre/library/caches.py
+++ b/src/calibre/library/caches.py
@@ -912,13 +912,12 @@ class ResultCache(SearchQueryParser):  # {{{
     def set_marked_ids(self, id_dict):
         '''
         ids in id_dict are "marked". They can be searched for by
-        using the search term ``marked:true``. Pass in an empty dictionary or
-        set to clear marked ids.
+        using the search term ``marked:true`` or ``marked:value``.
+        Pass in an empty dictionary or set to clear marked ids.
 
         :param id_dict: Either a dictionary mapping ids to values or a set
-        of ids. In the latter case, the value is set to 'true' for all ids. If
-        a mapping is provided, then the search can be used to search for
-        particular values: ``marked:value``
+        of ids. If a mapping is provided, then the search can be used to search
+        for particular values: ``marked:value``
         '''
         if not hasattr(id_dict, 'items'):
             # Simple list. Make it a dict of string 'true'