diff --git a/lisp/org.el b/lisp/org.el
index 7e6735e79..28e2c9c71 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -1864,7 +1864,7 @@ will temporarily be changed to `time'."
 
 (defcustom org-refile-targets nil
   "Targets for refiling entries with \\[org-refile].
-This is list of cons cells.  Each cell contains:
+This is a list of cons cells.  Each cell contains:
 - a specification of the files to be considered, either a list of files,
   or a symbol whose function or variable value will be used to retrieve
   a file name or a list of file names.  If you use `org-agenda-files' for
@@ -1886,6 +1886,10 @@ This is list of cons cells.  Each cell contains:
     Note that, when `org-odd-levels-only' is set, level corresponds to
     order in hierarchy, not to the number of stars.
 
+Each element of this list generates a set of possible targets.
+The union of these sets is presented (with completion) to
+the user by `org-refile'.
+
 You can set the variable `org-refile-target-verify-function' to a function
 to verify each headline found by the simple criteria above.