diff --git a/AUTHORS b/AUTHORS
index cccce1850..5c9ecf892 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -316,6 +316,8 @@ Tom Yan <tom.ty89@gmail.com>
     * Fix to DVD chapter timestamp calculation for NTSC discs
     * Fix to 7.1 channel AAC extraction
     * Blu-ray PCM channel layout re-ordering
+    * Several fixes to the key frame handling when a frame only has a
+      foward but no backward reference
 
 Trinine <trinine@free.fr>
     * French translation
diff --git a/NEWS.md b/NEWS.md
index e1efb6d5e..49d3b07a1 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -30,6 +30,8 @@
   file `iso639_language_list.cpp` (before only numeric optimization levels
   were filtered out and only if it wasn't the last option in the list of
   flags). See #3105 for context.
+* mkvmerge, mkvextract: fixed key frame handling for `BlockGroup` elements
+  with a forward reference but no backward references. Patches by Tom Yan.
 
 
 # Version 57.0.0 "Till The End" 2021-05-22