diff --git a/features-json/opus.json b/features-json/opus.json
index 189a4719f3..c3d5a63df2 100644
--- a/features-json/opus.json
+++ b/features-json/opus.json
@@ -561,7 +561,7 @@
   },
   "notes":"Support refers to this format's use in the `audio` element, not other conditions.\r\n\r\nFor Opera the Linux version may be able to play it when the GStreamer module is up to date and the served mime-type is 'audio/ogg'.",
   "notes_by_num":{
-    "1":"Supported only when packaged in a CAF file and on macOS High Sierra/iOS 11 or later."
+    "1":"Supported only when packaged in a CAF file and on macOS High Sierra/iOS 11 or later (constant bit-rate only)."
   },
   "usage_perc_y":76.12,
   "usage_perc_a":19.26,