From aabbdbda525e9fbc8d373d952c5c6413cbf99082 Mon Sep 17 00:00:00 2001
From: Karl Williamson <public@khwilliamson.com>
Date: Mon, 6 Jan 2014 13:38:58 -0700
Subject: [PATCH] utf8.c: Add comment

---
 utf8.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/utf8.c b/utf8.c
index b4a688a..161fb21 100644
--- a/utf8.c
+++ b/utf8.c
@@ -2518,7 +2518,9 @@ Perl__core_swash_init(pTHX_ const char* pkg, const char* name, SV *listsv, I32 m
      * Thus there are three possible inputs to find the swash: <name>,
      * <listsv>, and <invlist>.  At least one must be specified.  The result
      * will be the union of the specified ones, although <listsv>'s various
-     * actions can intersect, etc. what <name> gives.
+     * actions can intersect, etc. what <name> gives.  To avoid going out to
+     * disk at all, <invlist> should specify completely what the swash should
+     * have, and <listsv> should be &PL_sv_undef and <name> should be "".
      *
      * <invlist> is only valid for binary properties */
 
-- 
2.7.4