diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index 6cbc75f92fb..73066dd6f3d 100644
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -40,8 +40,8 @@
 
 (defvar help-fns-describe-function-functions nil
   "List of functions to run in help buffer in `describe-function'.
-Those functions will be run after the header line and argument
-list was inserted, and before the documentation is inserted.
+Those functions will be run after the header line, the argument
+list, and the function's documentation are inserted.
 The functions will be called with one argument: the function's symbol.
 They can assume that a newline was output just before they were called,
 and they should terminate any of their own output with a newline.