diff --git a/ansi-tests/keyword.lsp b/ansi-tests/keyword.lsp
index 8583233a61cb9c106615784938becb4b5c3d0676..088a104e91484bd36694bd06522fe7fd964a7840 100644
--- a/ansi-tests/keyword.lsp
+++ b/ansi-tests/keyword.lsp
@@ -38,6 +38,10 @@
        (notnot (constantp s)))))
   nil t :external t t t)
 
+;;; Note that the case of a symbol inherited into KEYWORD cannot arise
+;;; standardly from user actions, since USE-PACKAGE disallows KEYWORD
+;;; as the package designated by its second argument.
+
 ;; Every keyword is external
 (deftest keyword.2
   (do-symbols (s "KEYWORD" t)