diff --git a/docs/KNOWN_BUGS b/docs/KNOWN_BUGS
index ec5c673912..170132f507 100644
--- a/docs/KNOWN_BUGS
+++ b/docs/KNOWN_BUGS
@@ -107,6 +107,7 @@ problems may have been fixed or changed somewhat since this was written.
  18. HTTP/3
  18.1 connection migration does not work
  18.2 quiche: QUIC connection is draining
+ 18.3 OpenSSL-QUIC problems on google.com
 
  19. RTSP
  19.1 Some methods do not support response bodies
@@ -642,6 +643,15 @@ problems may have been fixed or changed somewhat since this was written.
 
  https://github.com/curl/curl/issues/12037
 
+18.3 OpenSSL-QUIC problems on google.com
+
+ With some specific Google servers, and seemingly timing dependent, the
+ OpenSSL-QUIC backend seems to not actually send off the HTTP/3 request which
+ makes the QUIC connection just sit idle until killed by the server. curl or
+ OpenSSL bug?
+
+ https://github.com/curl/curl/issues/18336
+
 19. RTSP
 
 19.1 Some methods do not support response bodies