From 58ca741a1cf22b23d5a02220e9cd21d626e63399 Mon Sep 17 00:00:00 2001
From: Dianne Skoll <dianne@skoll.ca>
Date: Thu, 14 Oct 2021 10:38:11 -0400
Subject: [PATCH] Update docs.

---
 rem2html/rem2html | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/rem2html/rem2html b/rem2html/rem2html
index 07ac82da..a470a464 100644
--- a/rem2html/rem2html
+++ b/rem2html/rem2html
@@ -55,8 +55,15 @@ month name a link to I<url>.
 
 =item --imgbase I<url>
 
-When creating URLs for the stylesheet, use
-I<url> as the base URL.
+When creating URLs for the stylesheet or external images, use I<url>
+as the base URL.
+
+=item --pngs
+
+Normally, rem2html uses inline "data:" URLs for the moon phase images,
+yielding a standalone HTML file.  The C<--pngs> option makes it use
+external images named firstquarter.png, fullmoon.png, lastquarter.png
+and newmoon.png, which are expected to live in C<--imgbase>.
 
 =item --stylesheet I<url.css>