diff --git a/doc/draft-ietf-codec-opus.xml b/doc/draft-ietf-codec-opus.xml
index ba5db9db..4b6c03a1 100644
--- a/doc/draft-ietf-codec-opus.xml
+++ b/doc/draft-ietf-codec-opus.xml
@@ -514,16 +514,16 @@ Insert decoder figure.
tapset [2, 1, 1]/4post-filter
transient logp=3
coarse energy
-tf_change Section X
-tf_select logp=1Section X
+tf_change
+tf_select logp=1
spread [7, 2, 21, 2]/32
-dyn. alloc. Section X
+dyn. alloc.
alloc. trim [2, 2, 5, 10, 22, 46, 22, 10, 5, 2, 2]/128
-skip (*) Section X
-intensity (*)Section X
+skip (*) logp=1
+intensity (*)uniform
dual (*) logp=1
fine energy
-residual Section X
+residual
anti-collapselogp=1stereo && transient
finalize
Order of the symbols in the CELT section of the bit-stream
@@ -539,6 +539,21 @@ decoding, or transmission and SHOULD take measures to conceal the error and/or r
to the application that a problem has occurred.
+
+
+The transient flag encoded in the bit-stream has a
+probability of 1/8. When it is set, then the MDCT coefficients represent multiple
+short MDCTs in the frame. When not set, the coefficients represent a single
+long MDCT for the frame. In addition to the global transient flag is a per-band
+binary flag to change the time-frequency (tf) resolution independently in each band. The
+change in tf resolution is defined in tf_select_table[][] in celt.c and depends
+on the frame size, whether the transient flag is set, and the value of tf_select.
+The tf_select flag uses a 1/2 probability, but is only decoded
+if it can have an impact on the result knowing the value of all per-band
+tf_change flags.
+
+
+
The energy of each band is extracted from the bit-stream in two steps according