diff --git a/doc/draft-ietf-codec-opus.xml b/doc/draft-ietf-codec-opus.xml
index 0f4cfbb6b04b5ac20aa710443542e75b633a0d1f..c23ae7e220f0d32891add1fd4857e84a5734c087 100644
--- a/doc/draft-ietf-codec-opus.xml
+++ b/doc/draft-ietf-codec-opus.xml
@@ -7419,7 +7419,9 @@ Development snapshots are provided at
 Because of size constraints, the Opus test vectors are not distributed in this
 draft. They are available from the Opus codec website at 
 <eref target="http://opus-codec.org/testvectors/"/> and will also be made available
-in IETF meeting proceedings.
+in IETF meeting proceedings. These test vectors were created specifically to exercise
+all aspects of the decoder and therefore the audio quality of the decoded output is
+significantly lower than what Opus can achieve in normal operation. 
 </t>
 
 <t>