update title

index.bs

@@ -3078,7 +3078,7 @@ This section provides a guideline to generate [=element_mix_config=].
 
 An IA multiplexer may merge two [=IA Sequence=]s (or two [=Audio Element=]s). In this case, it adjusts the gain values for [=element_mix_config=]s as necessary to describe the desired relative gains between the [=IA Sequence=]s (or two [=Audio Element=]s) when they are summed to generate the final mix. It also ensures that the gains selected do not result in clipping when the final mix is generated.
 
-### Annex A4: Two Audio Elements with One Codec Config (Informative) ### {#iamfgeneration-multipleaudioelements-onecodec}
+### Annex A4: Two Audio Elements Encoding with One Codec Config (Informative) ### {#iamfgeneration-multipleaudioelements-onecodec}
 
 This section provides a way to generate an [=IA Sequence=] with two [=Audio Element=]s from two [[#profiles-simple|Simple Profile]] [=IA Sequence=]s with the same [=Codec Config OBU=]. The result complies with the [[#profiles-base|Base Profile]].