diff --git a/mercurial/help/internals/changegroups.txt b/mercurial/help/internals/changegroups.txt
--- a/mercurial/help/internals/changegroups.txt
+++ b/mercurial/help/internals/changegroups.txt
@@ -108,7 +108,7 @@ The *delta data* consists of ``chunklen
series of *delta*s, densely packed (no separators). These deltas describe a diff
from an existing entry (either that the recipient already has, or previously
specified in the bundle/changegroup). The format is described more fully in
-``hg help internals.bdiff``, but briefly:
+``hg help internals.bdiff``, but briefly::
+---------------------------------------------------------------+
| | | | |
diff --git a/tests/test-help.t b/tests/test-help.t
--- a/tests/test-help.t
+++ b/tests/test-help.t
@@ -1063,12 +1063,12 @@ sub-topics can be accessed
has, or previously specified in the bundle/changegroup). The format is
described more fully in "hg help internals.bdiff", but briefly:
- +---------------------------------------------------------------+ |
- | | | | | start offset | end
- offset | new length | content | | (4 bytes) | (4
- bytes) | (4 bytes) | (
+
+---------------------------------------------------------------+ | | | | | | start offset | end offset | new length | content | | (4 bytes) | (4 bytes) | (4 bytes) | (<new length> bytes) | | | | | | +---------------------------------------------------------------+ - +
Please note that the length field in the delta data does *not* include itself.