diff --git a/doc/ietf/draft-valin-celt-rtp-profile.xml b/doc/ietf/draft-valin-celt-rtp-profile.xml
index a5c45bfe..95596cca 100644
--- a/doc/ietf/draft-valin-celt-rtp-profile.xml
+++ b/doc/ietf/draft-valin-celt-rtp-profile.xml
@@ -438,24 +438,20 @@ headers and the length bytes). The value MUST be rounded to an integer number
of bytes per frame. The round-to-nearest method is RECOMMENDED. The default
bit-rate value is 64 kbit/s per channel.
-frame-size: The frame size is the duration of each frame in samples. If more than one frame size is supported, a comma-separated list can be used. It is possible to use "any" to denote that
-all even frame sizes are supported. The default is 480.
+frame-size: The frame size is the duration of each frame in samples and has to be even.
+The default is 480.
mapping: Optional string describing the multi-channel mapping.
-Because the frame-size is not transmitted in-band, an SDP answer MUST
-contain only one frame-size, even if multiple frame sizes were offered.
-
-
The selected frame-size values MUST be even. For quality and complexity
reasons, they SHOULD also be divisible by 8 and have a prime factorization
which consists only of 2, 3, or 5 factors.
For example, powers-of-two and values such as 160, 320, 240, and 480 are
recommended. Implementations MUST support receiving and sending the default
-value of 480, and if the size 480 is supported it MUST be offered. Implementations
+value of 480. Implementations
SHOULD also support frame sizes of 256 and 512 since these are the ones that lead
to the lowest complexity. When frame sizes that are powers-of-two are supported,
they SHOULD be listed first in the offer and chosen over non-powers-of-two in the
@@ -571,7 +567,7 @@ For example a stereo configuration might signal:
m=audio 8008 RTP/AVP 97
a=ptime: 5
a=rtpmap:97 CELT/44100/2
-a=fmtp:97 frame-size=256;
+a=fmtp:97 frame-size=256
Which specifies a single two-channel CELT stream according to the default
mapping.