diff --git a/spec/ttml2.xml b/spec/ttml2.xml
index fa7bb087f..ebd8554f3 100644
--- a/spec/ttml2.xml
+++ b/spec/ttml2.xml
@@ -17458,7 +17458,7 @@ clock-time
: hours ":" minutes ":" seconds ( fraction | ":" frames ( "." sub-frames )? )?
offset-time
- : time-count fraction? metric?
+ : time-count fraction? metric
wallclock-time
: "wallclock(" clock
time base applies.
If a <time-expression> is expressed in terms of an
-s
(seconds) were specified.
It is considered an error if the clock
.
If the computed value of the governing time base is smpte
, then