diff --git a/etc/codecs.conf b/etc/codecs.conf
index d9d4b36d4b..2043041f35 100644
--- a/etc/codecs.conf
+++ b/etc/codecs.conf
@@ -339,14 +339,16 @@ audiocodec msadpcm
   driver msadpcm
 
 audiocodec fox61adpcm
-  info "Format 0x61 ADPCM"
+  info "Duck DK4 ADPCM (rogue format number)"
   status working
+  comment "This format number was used by Duck Corp. but not officially registered with Microsoft"
   format 0x61
   driver fox61adpcm
 
 audiocodec fox62adpcm
-  info "Format 0x62 ADPCM"
+  info "Duck DK3 ADPCM (rogue format number)"
   status working
+  comment "This format number was used by Duck Corp. but not officially registered with Microsoft"
   format 0x62
   driver fox62adpcm