diff --git a/docs/KNOWN_BUGS b/docs/KNOWN_BUGS
index e6478728d7..feee444951 100644
--- a/docs/KNOWN_BUGS
+++ b/docs/KNOWN_BUGS
@@ -158,6 +158,7 @@ problems may have been fixed or changed somewhat since this was written.
 
  18. HTTP/3
  18.1 If the HTTP/3 server closes connection during upload curl hangs
+ 18.3 configure --with-ca-fallback is not supported by h3
  18.2 Transfer closed with n bytes remaining to read
  18.9 connection migration does not work
 
@@ -1124,6 +1125,10 @@ problems may have been fixed or changed somewhat since this was written.
 
  https://github.com/curl/curl/issues/8523
 
+18.3 configure --with-ca-fallback is not supported by h3
+
+ https://github.com/curl/curl/issues/8696
+
 18.9 connection migration does not work
 
  https://github.com/curl/curl/issues/7695