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-rw-r--r--lib/PublicInbox/UserContent.pm1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/PublicInbox/UserContent.pm b/lib/PublicInbox/UserContent.pm
index f01160d4..81a2a502 100644
--- a/lib/PublicInbox/UserContent.pm
+++ b/lib/PublicInbox/UserContent.pm
@@ -11,6 +11,7 @@ use warnings;
 sub CSS () {
         <<'_'
         /*
+         * CC0-1.0 <https://creativecommons.org/publicdomain/zero/1.0/legalcode>
          * Dark color scheme using 216 web-safe colors, inspired
          * somewhat by the default color scheme in mutt.
          * It reduces eyestrain for me, and energy usage for all: