oggopus: Clarify leading zeros are ok for R128 tags.
Add a limit of no more than 6 characters for these tags' values.
diff --git a/doc/draft-ietf-codec-oggopus.xml b/doc/draft-ietf-codec-oggopus.xml
index cf1b787..128c343 100644
--- a/doc/draft-ietf-codec-oggopus.xml
+++ b/doc/draft-ietf-codec-oggopus.xml
@@ -1217,8 +1217,10 @@
<t>
An Ogg Opus stream MUST NOT have more than one of each tag, and if present
their values MUST be an integer from -32768 to 32767, inclusive,
- represented in ASCII with no whitespace.
+ represented in ASCII as a base 10 number with no whitespace.
A leading '+' or '-' character is valid.
+Leading zeros are also permitted, but the value MUST be represented in
+ no more than 6 characters.
Other non-digit characters MUST NOT be present.
</t>
<t>
