diff --git a/src/quorum/util.py b/src/quorum/util.py
index ba4f8a82..524690a0 100644
--- a/src/quorum/util.py
+++ b/src/quorum/util.py
@@ -117,10 +117,13 @@ def to_sort(sort_s):
     find_d = to_find,
     find_i = bool,
     sort = to_sort,
-    meta = bool
+    meta = bool,
+    fields = list
 )
 """ The map associating the various find fields with
-their respective types """
+their respective types, note that in case a special
+conversion operation is required the associated value
+may represent a conversion function instead """
 
 FIND_DEFAULTS = dict(
     limit = 10