Use 'pre-skip' consistently with the hyphen.
diff --git a/doc/draft-ietf-codec-oggopus.xml b/doc/draft-ietf-codec-oggopus.xml
index 0a79693..b7e1f0c 100644
--- a/doc/draft-ietf-codec-oggopus.xml
+++ b/doc/draft-ietf-codec-oggopus.xml
@@ -1245,7 +1245,7 @@
the beginning to avoid the Opus encoder having to encode a discontinuous
signal.
For an input file containing 'length' samples, the Ogg encoder SHOULD set the
- preskip header value to delay_samples+extra_samples, encode at least
+ pre-skip header value to delay_samples+extra_samples, encode at least
length+delay_samples+extra_samples samples, and set the granulepos of the last
page to length+delay_samples+extra_samples.
This ensures that the encoded file has the same duration as the original, with
@@ -1305,7 +1305,7 @@
frame.</t>
<t>Begin the second segment with a copy of the last frame of the first
segment.</t>
-<t>Set the preskip value of the second stream in such a way as to properly
+<t>Set the pre-skip value of the second stream in such a way as to properly
join the two streams.</t>
<t>Continue the encoding process normally from there, without any reset to
the encoder.</t>
