diff --git a/MozillaThunderbird.changes b/MozillaThunderbird.changes
index 5710787..1730411 100644
--- a/MozillaThunderbird.changes
+++ b/MozillaThunderbird.changes
@@ -2,6 +2,9 @@
 Tue Aug 17 07:19:15 UTC 2021 - Wolfgang Rosenauer <wr@rosenauer.org>
 
 - Mozilla Thunderbird 91.0.1
+  MFSA 2021-37 (bsc#1189547)
+  * CVE-2021-29991 (bmo#1724896)
+    Header Splitting possible with HTTP/3 Responses
 - appdate screenshot URL updated (by mailaender@opensuse.org)
 
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